My wife and I stayed in Inma's apartment for two months. Inma is a very nice hostess and she did whatever she could to make our stay comfortable. The apartment is nicely located so close to Gran Via and everything interesting is in the walking distance. I believe for two months and two persons the apartment is a bit small. Unfortunately, it does not get any sunlight which is no problem in the summer since there is a very nice swimming pool and terrace at the top of the building full of sun, however in the winter it was a bit problematic. I guess for a couple of days and touristic visit in Madrid this apartment is ideal.
The neighbors could be sometimes noisy in the middle of the night but since I was there for work I had to sleep soon and if you stay only for a few days there is a good chance you don't have this problem.
All and all, very good and having a nice hostess who speaks good English makes many things easier.