We stayed at Melissa's apartment for 3 nights and loved the place. It is located in a nice quiet neighbourhood, close to a shopping area, Santiago Bernabeu stadium, with good transportation links, and close to the city center (via metro). Melissa has sent us detailed instructions about the accommodation well in advance, which helped us and made things easier (e.g. how to find the address, what are the rules in the building, how to use certain facilities, etc.). She was available to communicate with during our stay, and considerate to our questions.
The apartment is comfortable, large enough, very clean. I highly recommend this place!