I stayed at Luis' flat for the month of July. He was incredibly communicative in the months leading up to my stay and even printed out subway maps, bus routes, neighborhood spots and a few more things that I very much appreciated. .
The flat itself is about 20/30 minutes by train to city center near the Lucero and Laguna stops which makes getting into the city and around pretty easy. It's also near several bus stops but i personally opted for the metro.
The room was exactly what i needed I will only say that without ac it did get quite hot sometimes even with the fan provided.