My stay at Madrid was really awesome. I really appreciated that Ulises' apartment was conveniently close to the metro station. It was walking distance to several key destinations (although you do need to ask for directions), and walking distance to restaurants at Cava Baja as well.
The apartment was a very pleasant surprise for me. For one, it's huge! :) It's a lot larger than what I assumed from the picture. It also had all the necessities that made my stay very hassle-free -- a full kitchen with the basic cooking ingredients, laundry facilities, wifi, etc.