The ability to take constructive criticism and learn from it can truly set successful investors apart from those who struggle.It's important to remember that not all feedback is personal; often, it comes from a place of experience and care.

I have a "friend" that has an apartment unit that consistently has bad tenants.

Especially for large development (ie apartment and condo buildings), where many of our housing units come from.

But renting an entire apartment or house is not cheaper than a hotel room, which is only a bedroom and bathroom. 

Let's say it's a suburban home in a decent to nice neighborhood, ARV $200-$500k.Do you make signing a quit claim deed a part of your cash for keys agreement?

However, I know I eventually want to move into multifamily and apartment investing/syndications.

I think a lot of times you get what you give - I've been a part of a couple during times where I really just wasn't spending time interacting, making posts, doing the assigned tasks, attending all the calls, etc.

A 20' wide vacant 4-unit two story apartment building.

BTR is still a very small portion of the market in deliveries and less efficient than apartments I'd stay clear if you are new. 

This is a basement apartment, I not only advise to run a dehumidifier but I stress to her the importance of doing so in the summer months, and provide her with a brand new, 400$ dehumidifier when she moved in.