The flat was great, same as in pictures, and really well equipped. Loved the location and the neighbourhood (clean and quiet). Communication with the host was easy and the check in was flawless. The building entrance is also very nice, with a lift for convenience.
A few things to note that others might not have mentioned: there were some issues with the heating and setting the desired temperature in winter months, it was cold in the flat at first (took around 3 days to get there, but after it worked just fine), second when it rains it can get really loud in the large bedroom (might be the material of the roof or something that you hear all the drops) - not a real issue as it barely rains in Barcelona, and third the main apartment door opens up with a code and cannot be locked from the inside so anyone with a code could have access (again safety of the guests is a priority for the host so not a concern but sometimes feeling unease).
Overall would highly recommend this place!