I stayed in Calvin's apartment for a week and used his apartment as base to explore Edinburgh.
His apartment is right on the 35 and 1 bus routes which can bring you close to anything in Edinburgh. Also 1 block away from numerous other bus routes.
They share the apartment, but it worked very well in terms of privacy and own bathroom.
Check in entailed meeting him at the apartment, him handing over the keys and explaining everything and showing where everything is in the kitchen.
The apartment is extremely clean and tidy.
Communication beforehand was extremely efficient.
It felt like staying with a friend in Edinburgh!