I was told here and there that renting out a SFH that has keyed entry bedroom door knobs (standard single cylinder and turn-button on the other side) is a fire hazard and against some kind of code or, if not, makes you liable for fire hazard dangers. 

Double close the same day. 

Lately I am putting laminated wood or ceramic in all my rentals sometimes I will put carpet in a bedroom but never in living room.... too much damage occurs in the living area

Make sure to check both city and county, a lot of people forget that a lot of houses are double taxed.

I have no problem with the neighbor adding a vent, however, the location happens to abut our bedroom wall, where there is open space. 

One can spend hours talking about risks.At a high level you can remove all risks by doing 2 things 1) Adding disclaimer when you sell AND/OR 2) Doing double close aka you buy first and then you sell. 

Good deal- just as a comparison, I have 2 (2) bedroom properties in this area that rent for $675 each.

I currently rent a 3 bedroom one bath for $1,020.00 per month.

I don't mind sharing my spreadsheet to double check my analysis either.

I had a friend move in with me into one of the bedrooms and they paid $500/month.