The issue though as @Darryl Young and @Greg Kimura have said is that it's leaky in some parts, particularly this vent that connects to the tenant's bathroom fan.  

In my personal opinion, if I was renting a room with a group of roommates, I would want more than one bathroom for 4 rooms.

Try looking into zillow/Redfin and see what your potential rents you can get near the neighborhood by filtering the bedrooms/bathrooms of the intentional property that you are planning to buy.

So if the second kitchen has the sink backing onto a wall that has plumbing on the other side (eg another kitchen or bathroom) or it can be run from the basement up. 

The guest house is set up with a kitchen, bathroom, and then a large living room area that would double as a bedroom.

There are water stains in the ceiling, the electric needs some help in the floor two bathroom, as well as the water pressure in the shower.

We are furnishing with contract grade quality and amenity heavy (game room/hot tub/murals/new paint/lighting and ALL basics needed to host a 5* stay so all bedding, kitchen items, bathroom items, linen and bedding as well as the labor for trades.

does anyone know about AMAZONS Puzhong's New Spire prefabricated House Container House B&B with Bathroom and Kitchen

(Kitchen bathroom doors flooring etc) Probably currently worth appx 20k as is but has potential to get around 80-90 with some work or 100-120 with a total rehab could possibly even make into 2 apartments and Brrrr it.

Have put some work into it, refinished bathroom, revamped landscaping, new front and back porches.