The location of the apartment is unbeatable. Steps to Plaza de Mayor, 10 min to the royal palace, minutes to metro stations, supermarkets. The apartment is very clean, the kitchen has all you need. Albert, Consuelo's husband is very nice and helpful.
One word of caution though - there is no elevator in the building, so if you have a problem climbing 5 floors it might be challenging for you. For us it was no problem, so, hands down 5+ stars.