We booked Joseps apartment as a group of three. The whole checkin process went seamlessly although we checked in at around midnight. The area around the flat is great. Lots of little cafes and restaurants while also being close to many sights. The apartment itself was not as modern as the pictures made it seem but all around like we expected.
Our stay was sadly overshadowed by construction work happening in the building during the first three days. A very high level of noise and no running water on the first morning resulted in us not being able to enjoy our stay as much as we hoped. We communicated with Josep and finally came to the agreement to cancel the stay and move somewhere else. Although at first a bit reluctant, Josep then quickly agreed to this resolution.
All in all definitely recommendable for a short stay in Barcelona.