That, in my experience, is more art than science.What I'll typically do is reference Rentometer first and keep that in mind while I consider whether my unit is above, below, or right at average quality. 

We buy and sell properties throughout the GNO area and work with a number of reputable and quality contractors.

But I've found that there are more factors in response rate than just the price- like quality of photos, time of year, allows pets, tenant criteria, etc.

I'd rather pay extra for a quality product that has no subscription than anything with a monthly fee.Needs to have a huge value that no one else can provide to get me to allow another company to dip into my bank account each month.

Several quality providers are active here on BP. 

How much you get will depend on the quality of the units as well. 

He is very professional,dependable, reasonable, and does quality work!

No events, No gathering, No good quality bookings.

So, if you planned to own it for 30 years you could be relatively sure that you will replace the:  plumbing, windows, siding, floor joists/piers, and roof (again) . . . that's not touching aesthetic/cosmetic things that will possibly be replaced along the way. 

In the long run, passive investments seem like it'll definitely factor into the plan, but I'm presently more interested in learning and gaining experience with individual investments - assuming that having some more experience now may help to ascertain the quality of a MF investment down the road.