Our family of four (including college-age kids) really enjoyed this apartment. It's very quaint and unique, with plenty of room to stretch out and relax. It's on a nice street with many restaurants and bars, so it made dining easy when you just want to grab a bite nearby.
The apartment is also very convenient to the Metro and some of the main attractions (e.g., Plaza Mayor, Plaza Del Sol, Mercado de San Miguel); we were able to walk to most places, including Reina Sofia (~20-25 minute walk).
The host was very responsive and helpful with suggestions. We'd stay here again!