Staying at Joseph's place was a very pleasant experience! From check-in to check-out everything went smooth.
At the check-in, we got very detailed explanations about the room, for example about how to correctly lock all the doors which is quite extensive. Personally, we liked this a lot as it made us feel perfectly safe to leave our belongings in the room.
Joseph is very caring about your stay. During our five day stay, he asked multiple times whether we were doing alright and made sure that the bathroom was very clean every day. He made sure that we had water available and gave us earplugs against the noise. It was also possible to do laundry which I appreciated.
Even though the apartment is right in the Gothic quarter, the city's noise did not cause us any annoyances. Indeed, the great benefit of the location is that one was able to do a lot of attractions by foot! We bought a five-day travel card, but would actually not have needed it because of the apartment's central location.

The only thing to be aware of is that this room is one of three 1-2 people rooms in Joseph's apartment (so 4 rooms in total), who share a single bathroom that includes a shower and a toilet. During our 5 day stay, it occurred once that tenants from another room were still in the bathroom when we wanted to get ready.
All in all, we were very satisfied, had an incredibly clean apartment, a great host and a wonderful place to explore all of Barcelona!