I had a really good stay, although I didn't get to meet Oscar personally. But the Check-In was taken care of, he made sure that I could always reach him via message and I felt very welcome in his home. The room and the apartment are very comfortable, Oscar has a love for detail, and the apartment has everything you might need!
I didn't like the location of the apartment that much. Considering that in Madrid all the important things are gathered in the center, I was a little annoyed of always having to take the metro to reach the city center but than from there everything was kind of within walking distance (my fault, that I didn't research it better beforehand). Oscars place is perfect if you also want to spend time just in the apartment, cook some meals, etc.