Sergio welcomed us the very moment we arrived in Lavapiés. As I had to bring our rental car to the airport, I just dropped my friends and Sergio showed them the apartment. Sergio is a very nice person and responded to my messages very quickly.
The apartment is located near the metro station and was perfect to spent the night in, although it was a bit cold (there are no radiators in there, only an electric heater). My friends were satisfied as well and would spent the night there again!