My experience was top notch both with our hosts and with the quality and location of the flat.
I had a bit of trouble with the keys and with the stove (MY fault, not the flat's) and Iaia was completely willing to drop everything and come over if I needed her. Of course, I didn't end up needing her because she explained everything over the phone.
We found the area to be lovely and vibrant, lots going on, and the flat is quiet and cool in the summer. The grocery store and metro are a 2 minute walk and there are great places to eat and drink everywhere! Added bonus: Sol is only one stop away.