Antonio's place is central, close to many attractions in Madrid. The apartment is very clean and stylish. We liked that it has a dishwasher. The shower has great water pressure.
The area is quiet, however, the wall connecting the bedroom with the next apartment is thin, so if there are noisy Airbnbers next door, you'll hear them quite loudly and clearly (conversation, etc). Our neighbors were obnoxiously loud, but the host talked to them and got them to quiet down. For a while. Do bring quality earplugs, just in case!
Our host was very helpful, providing us with every bit of information we needed, local tips and advice. Communication was excellent, and the host was gracious to let us check in earlier.