Mercedes is lovely. She was very welcoming, helped get us a driver to pick us up from the airport and showed us around her place with kindness. Breakfast was put out as well as plenty of drinks and snacks.
The location of the flat couldn't be more central, which is great to explore from, however, it also means it is loud and raucous over weekends.
There are three rooms to rent in this apartment and ours was certainly the smallest of them, and it was very tight for a couple, with luggage. Even the bed was not quite big enough for us to stretch out in.
The main problem was the smell coming from the bathroom, this is a problem with the drains in Barcelona but it made it quite hard to stay in the room with such a strong smell coming from it.
I am sure a larger room and a room with no smell would be much better.