The apartment was conveniently located within 6 minutes walking distance of Sagrada Familia. Maria's assistant, Milli was available during both check in and check out to help us and the kitchen was conveniently stocked with fruits, snacks when we arrived. Milli went with us over all the facilities and pointed out that the light in the second bathroom wasn't working.
The rooms:
The master suite has a changing room with AC and a large bathroom, which everyone ended up using. The bedroom in the master suite doesn't have a door, there is a single door to allow access into the master suite. We were advised to not use the master bathroom during the hours of 12 pm - 7 am to avoid disturbing the neighbors.
The second bedroom doesn't have an AC and there are restrictions on when and what setting the fans can be used at. The fan must only be used at the lowest setting and not used all night since it disturbs the neighbors. This may be an issue if you're visiting during summer.
The third room is quite tiny and is not equipped with an AC, the shower in the third bathroom is so tiny as to be practically unusable that I ended up showering in the main bathroom throughout my stay.
On the whole, the apartment was at a great spot and sleeps four comfortably, at least during cooler months (given that the fan can't be used in the second bedroom). I'm skeptical of the third room and bathroom being advertised as such, since they are considerably smaller than the other two. However, the hospitality was great and the responses prompt.