Overall, the location is great since it's closer to the metro and to many nice restaurants in a central area of Madrid. Melvin is also very responsive but the apartment is far from being great. Melvin has over 10,000 reviews so maybe one day he used to be excellent, but several zero stars reviews in a raw would not impact his reputation, and he is probably slacking off.
The photos of the listing are edited to remove some murals of the building that in fact looks trashy. I didn't' care about that but being honest about the listing would have been nicer.
The shower was broken: the handle could not hang and the extra hoses shown in the photos are not working; The shower also had calcareous areas, the walls are dirty and could benefit from a repaint.
Via text messages, we agreed that the host would have made it on time. She told us to let her know when we were 5 minutes away but we did and we waited over 30 minutes. It was 118 F. in Madrid and we waited outside in the heat. We never saw Melvin. The check-in lady was annoyed that we let her notice the smell inside the house. She agreed and just opened the windows.
This is an apartment is a split into 3, and you can hear people/babies crying on the other side of the wall; the stair to reach the apartment are wooden and really deformed but overall kind of funny.