Sometimes adding a 1/2 bath (toilet and sink) is way cheaper than adding the whole bath.I've done them by "shrinking" a bedroom and adding a separate door, adding it into a pre-existing a laundry room, and making a small room between an attached garage and a house.The cheapest one I ever did was the one in the laundry room.

All traps should have had anti-freeze poured in (that's sinks, tubs, shower pans, toilet bowls).

His kids stuff toys in the toilet and it overflowed and cascaded down through two units, at 8 p.m on a Friday.   

Before you rent out the property be sure and replace anything that may go out in the near future...water heater, HVAC, garbage disposal, faucets, toilet mechanisms, supply lines to toilets and faucets, dishwasher, etc. 

I don't consider it "debt" necessarily since my cash is sitting as a principal reduction on the line compared to sitting in a savings account earning squat.

I pay market rent and handle the minor repairs, which the owners love because I'm not calling them about a leaking toilet like a regular tenant would.

The plumber discovered that the toilet in an upstairs bathroom was leaking.

Single Story 3 bed 2 bath 1585 sqftPaint Interior - 1585 sq ft - $1.9/sq ft = $3,000Scrape popcorn ceiling, texture, and paint - 1350 sq ft - $3.1/sq ft = $4,185Remove old carpet and install vinyl plank flooring - 1175 sqft - $5/sqft = $5,875Replace carpet with new carpet - 410 sq ft - $2.2/sqft = $910Remove dead grass and install sod - 1850 sqft - $2.1/sq ft = $3,850New two car garage door/opener/track and installation = $1,500New window and installation = $250 eachBathroom remodel - vanity, mirror, light, toilet, demo and build back new tub or shower with ceramic tile - $4,500Kitchen remodel - 30sqft quartz, 12ft upper cabinets, 12ft lower, backsplash, sink/garbage disposal, $9kThere are many more items to be repaired/replaced but I realize this is turning into a long post so I will stop there.

Yes, you need a great cleaner (and a backup) who besides cleaning can do things like re-stock the toilet paper, and maybe plug-in a new toaster if the old one breaks.

A $300 profit margin BEFORE yard maintenance, insurance, and water could be tight... you want to be enough in the black each month to be putting some aside for a fund for when a toilet breaks, or when you have to do repairs in between tenants.