I currently have 4 and they're cash flowing quite well.I've been reviewing a few discussions here on BP that discuss the benefits and disadvantages of withdrawing money from a 401k, using self-directed 401ks, matching/not matching employer 401k contributions, and a whole bunch of other options.

Also, if I'm a buyer, would there really be any disadvantage in using an agent?

Are there any advantages when filing for taxes or disadvantages?

The residents do have to walk to the back of the building to use the facility which is a slight disadvantage. 

Trying to best understand how to structure a family member occupied investment property. are there any advantages/disadvantages in structuring it as a not for profit rental vs rental (e.g. with depreciation assessment at sale)?

Before there were tax deferred investment vehicles like self directed 401ks, IRAs, Keoughs, etc.  60 plus years ago any analysis of the comparative advantages or disadvantages of whole life would have included none of the tax deferred competition available today. 

So 5% of gross commission of a $160k house compared to a million dollar home is a big difference so logistically you're at an disadvantage.

What advantages and disadvantages do you see with each?

If most nearby rentals offer in-unit laundry, it could be a significant disadvantage not to provide the same.

Think about the advantages and disadvantages of investing locally vs outside of the area.