The first thing that hit me about Mimi's flat was the amazing, high ceilings. All the rooms are large and well decorated. The lounge is comfortable with a great view over the Bruntsfield Links/Meadows towards the castle, and the kitchen has everything you'd need (although honestly we didn't use it with all the great food places nearby - I'd recommend Chaskaa Indian about 5mins from the flat).
The bedrooms were nice with very comfortable beds, and the bathrooms benefited from great showers. The only thing I would warn was that the boiler was off when we arrived. Edinburgh can be freezing so I was a bit surprised it was off. Definitely check that when you check in!
We were there for the Six Nations and the flat is well located if you don't mind a walk. It was about 20/30 minutes to the city centre and main train station, where you can catch the tram to the stadium. The walk through the Meadows to the city is lovely.
Overall it was a great stay and I would definitely recommend it.