Maria's appartment is very well located, close to the Parc de la Ciutadella, very close to the metro (2 minutes by foot) and close to every commodities.
There is no Air Conditionned but the electric fan helps no to feel too hot.
The appartment is well furnished with toys for kids, books about the city and the kitchen is perfect. The bathroom is as well totally convenient.
I would place a caveat on the quality of the bed in the parents room which is not top quality. Might be a problem for guests with back problems.