Al was a fantastic host. We chatted for about 20-30 min and he told us about his favorite spots around the city. He had little snacks and juice available which was great when we were on the go. The studio is a great size and the bed is extremely comfortable. Most crucially for us, the air conditioning was a dream!
A couple things to note, this is a serious 4th floor walk-up so prepare to climb some stairs. We didn't find this to be a problem (30s and in shape), but some might. Also, there is no separate shower space - the whole bathroom is essentially a shower like you might find in Eastern Europe. Again, not a problem, but something to be aware of.
All in all, this place was a great value right in the heart of Malasaña. We would happily stay at Al's studio again!