I loved Oscar's apartment! It was beautiful, well equipped, and in an excellent location! My only issue was with the door of the apartment. It seems like a strange thing to say to me, but I really struggled with the lock. I had the hardest time getting the door to open, and it wasn't just me! I had a friend with me the one time and she tried turning the key as well and had no luck getting the door open. That same time, a neighbor from the apartment next door happened to step into the hallway and saw us struggling. He tried to open the door and he struggled as well, though he did get it to open sooner than we would have. The other times I entered the apartment, opening the door (with the key) was at least a five-minute ordeal. I don't know if the lock can be changed, but if it can be, I suggested to Oscar that it is. The neighbor who tried his hand at it and struggled for a second had the same kind of lock on his door, so he was not unfamiliar with the style. I am now in another part of Spain and where I am staying now has a different lock style that opens much easier, so I wouldn't say I struggled because it was a European lock. I don't know why it was the way that it was, but it was a pain! It's also worth noting that the street the apartment on has a vibrant night life and can be quite loud. I was talking with another traveler who had a different central apartment on the other side of Plaza Mayor and his street was loud too. I think it's probably unavoidable in a central location. It didn't particularly bother me because I am not a sensitive sleeper, and it isn't a mark against this apartment because there's no way to control it, but if you are a sensitive sleeper, you may want to stay in a less central location. Despite the door and the noise, the rest of my stay was amazing! Even though I did a bunch of research prior to arriving, I still didn't know exactly what I wanted to do in Madrid or what I wanted to see. I ended up deciding as I went, and the apartment was central to all that I wanted to do! The farthest walk I took was probably 15-20 from the apartment, but Madrid is such a walkable city that I didn't even notice the length! If the lock is fixed, I would recommend this apartment to my friends and family.