We had a great time in Madrid staying at Guille's place. His friend Silvia welcomed us and explained all about the apartment. She also had a map to give us restaurant recommendations and highlight points of interest. It was so helpful!! The apartment has a nice layout with a roomy area for relaxing and socializing. Location was fabulous - only 3-5 minutes from a busy restaurant area and then only 10 from an amazing Mercado and other points of interest. We were able to walk everywhere. There is a small grocery just around the corner too.
One note - the bedroom is near the stairwell for the apartment building and with the late nature of the culture - you may want earplugs :) The bed and linens are very comfy and being able to keep the windows open to your own courtyard was so nice. We would definitely stay again should we make it back to Madrid!!