We enjoyed staying at Mercedes's apartment. It is well located (about 15 minutes walk to most of the areas we wanted to visit), the kitchen was well equipped and there is facilities to do laundry easily which was very welcome on our extended holiday.
We were there in a particularly hot week and thankfully the air-conditioning worked well, although the bedroom remained warm at night which meant we struggled a bit to sleep. One thing to note is that there are quite a few steep stairs to the apartment, which wasn't a problem for us but might be for some people.
In the end we wished we stayed longer! I would definitely recommend the apartment.