Constantine’s apartment was great - exactly as described, in a lovely neighborhood, quiet during the nighttime but if you want action, there’s lots of bars and cafes right outside. It’s in walking distance to all the major sights. The apartment itself was very clean and spacious and there was a nice patio for sitting outside. There was coffee for free (and jam as well, but we didn’t use that). Constantine welcomed us to the apartment himself, gave us some recommendations and he also ordered a taxi for us to the airport on our last day because we had to leave really early. We can totally recommend Constantine’s apartment! We had a great time in Madrid.