They had an unfinished space counted as finished space increasing the size of the home by ~10%.

If your manager is just 'keeping an eye' on things, collecting/reminding on a few rents here and there and some light cleanup while being compensated in free or reduced space rent then classifying them as 1099 subcontractor is great. 

Might have a tenant that will sign a ten year lease and drop some money into the space.

Because they’re ideal for creating comfortable and functional shared living spaces.5.

—it’s also about reliability, attention to detail, and someone who just “gets” your space and your guests’ expectations.Do you have any hidden gems, local recommendations, or tips to share?

I'll just say that nothing is going to teach you more in this space than practical experience.

Quote from @Bob Avery: I don't recommend leaving a space blank because someone could later attempt to add something in.

You can get bids from several vendors in thsi space. 

Because there are nuances to seller financing, a lot of space would need to be devoted to covering the subject to make sense, and that requires sitting down to a cup of coffee for a long discussion.

If you find someone at a REA or other investor meetup group that is currently in this space it can make your first time go much smoother.