Staying with Salvador was great! He was hospitable and very nice. I was looking for an apartment while I was staying with him and he gave me some pointers about the search. The flat is located right in the heart of Lavapies which is a diverse and really interesting neighborhood in Madrid. One note is there's no elevator in the building. I'm not a fit person and the walk to the third floor wasn't a problem for me, but good to think about if you have mobility concerns.