@Pat Rach renting by the room is substantially more work for a landlord, but it also tends to produce substantially more rent income. Lots of properties that don't cashflow as a traditional rental WILL cashflow as a rent-by-room rental.
If you rent by the room, you will need to adjust your lease accordingly--which means thinking about all the various issues that might arise in rent by room situation (for instance--who is responsible for cleaning common areas, what are the rules about having guests, what are the rules about noise, etc.?).
In my experience, the most common issues that arise in rent-by-room situations are 1) a housemate is making too much noise, 2) a housemate is making too much mess and not cleaning up, or 3) a housemate is having too many guests over (who make too much noise and cause a lot of mess). These issues are almost guaranteed to occur at some point, so your lease should address these issues pre-emptively. It can be well worth it to hire a cleaner to take care of the common areas, and split that cost amongst the housemates. The lease should have terms about how frequently housemates can have guests, and whether those guests can stay overnight. The lease should also have terms about quiet hours, and acceptable levels of noise (the easiest way to deal with the noise issue is to not allow musical instruments, and to require everyone to use headphones instead of speakers).
You can manage utilities in a variety of ways--the easiest is for the owner to have all the utilities in their name, and then charge the tenants a flat fee for the utilities. Alternatively, the owner can sum the utilities each month, and then divide that number by the number of housemates and charge the housemates accordingly (this takes a little more work for the owner, but it helps ensure that everyone is paying their fair share).
Tenant screening is ESPECIALLY important in a rent by room situation--a bad housemate can make even the nicest property unbearable, so you should definitely study up on tenant screening (but, you should do this regardless of what type of rental you want to operate).
Also, the layout of the property is ESPECIALLY important; some houses simply do not function well in a rent by room situation. For instance, a small house, where all the bedrooms are right next to each other, and where all the housemates have to share a single bathroom will not function nearly as well as a larger house where the bedrooms are more spaced apart, and where each housemate gets their own bathroom. Square footage, bedroom spacing, and the bathroom to housemate ratio are probably three of the most important things to consider for a rent by room house--I'd strongly suggest avoiding any house where more than two housemates have to share a single bathroom.
Ideally, you want a large sq footage house with multiple stories, where the bedrooms and bathrooms are on separate floors. For instance, I have a 3-story property that's 5 br 3 ba --1 br/1 ba on the top floor, 2 br/1 ba on middle floor, and 2 br /1 ba on bottom floor. If I rented it by the room, this setup would make it so that no more than 2 people would be sleeping on each floor--this amount of separation would greatly reduce housemate disputes associated with noise problems, cleaning issues, etc., and would make the house much more comfortable for the housemates than a place where all five bedrooms were on the same floor.
Renting out rooms is a GREAT strategy for young adults. Most young adults can't afford their own place anyway, and usually have to have roommates regardless of where they live--if you're going to have roommates anyway, you might as well have roommates who are paying you! (However, keep in mind that the downside of this is that you can't be friends with your housemates in the same way that you could if you were all tenants...if you're the landlord, you're running a business, and this often means you have to be "the bad guy" and enforce rules).
Lastly, it's very important to understand that some neighborhoods will work great for rent by room, and others won't. First of all, some cities/neighborhoods have laws against rent by room. Just as importantly, some neighborhoods do not attract the type of tenant who will want to do rent by room. Usually, rent by room tenants are college students or single people in their 20s, so the property has to be in a neighborhood that attracts those types of tenants. For instance, a neighborhood right by a college campus, and/or near a trendy area that has the types of bars/restaurants and other amenities that attract young adults. ...most young adults don't want to live out in a suburb surrounded by families and retirees, they want to be surrounded by other young adults; so it's important for the property to be in that type of neighborhood (otherwise, you may end up with a lot of vacancy).
Good luck out there!