The cozy Callao apartment is in a great area of Madrid, close to everything and surrounded by shops and cafes. The apartment is small, but it has everything needed for a comfortable stay. A couple of items to note: as stated on the printed information in the apartment, the hot water tank holds 100 liters, which is only 26 gallons, and so taking showers, doing dishes, etc, must be very carefully planned. As an example, after washing 2 cups, 2 plates and some cutlery, there was not enough hot water to complete 1 shower. (An average shower (8 minutes) uses 17 gal. of hot water, and hand washing dishes uses an average of 2.25 gal. per place setting, so you run the risk of showering in cold water even if you are quick, and forget 2 showers in a row!). Also, even though the listing states that the apartment is non-smoking, there is a faint odor of smoke in the air and in the furniture - be warned if you are sensitive. Our host, Paula, was very nice, and responsive to our concerns, and also arranged a taxi to the airport for us on our last morning, which was on-time and very reasonable! All in all, a nice place, with a couple of caveats.