Very nice apartment. Awesome location. Very close to the museums, Plaza Mayor and Retiro Park. A little street noise for the front bedroom, but nearly every apartment I've ever rented in a big city has had street noise. The street is part of the ambiance.
I'm giving it 4 stars because it doesn't have air conditioning. That's not normally a requirement in Madrid, unless you pick the hottest July in 100 years for your trip. We did. Any other time, and a nice breeze, and this isn't an issue. It is high off the street, so gets a breeze.
Domingo was very timely, and worked well with us. Great walk through. Gave a map marking local restaurants and stores. He steers you in the right direction. Friendliest host during a four city tour of Spain this year.