I visited Edinburgh to attend a class, and stayed in the apartment in Leith for just over two weeks. I would definitely recommend the apartment, and plan to return for another stay. The location was perfect for my class, and it was well located for sightseeing in the city too. There are many amenities (pubs/restaurants/grocery stores) that are within walking distance, and the apartment is close to several bus stops which makes travel around the city a breeze.
The apartment itself is well maintained and clean. I really loved the large windows and natural light! The apartment is well laid out, neutrally decorated, and the abundance of natural light made it feel quite spacious. The kitchen is well equipped, and I really appreciated the Nespresso machine for my morning coffee. There isn't a microwave, but that isn't a must-have for me. The mezzanine bedroom is quite large and has two closets, and a double bed. The bathroom is a nice size and the water pressure in the shower was really good (not always a guarantee in older buildings). There is a lounge/livingroom area, as well as a separate high-top table to eat your meals.