We enjoyed our stay, I decided to highlight a few points for the next guests. I travelled to Barcelona with my husband and my parents, we know the city well and the apartment is on a superb location.
We had a few issues with the check in. Unfortunately we were only given the option of a virtual key through Apasios app, which didn't work. My husband and I are tech savvy, so we knew the problem didn't lie with us, and after spending 15 minutes on the phone with Apasios customer service they supplied a physical key to get in. We were very stressed and tired at that point, so probably recommend to ask for a physical key and try the virtual one once you are nice and set into the apartment.
The apartment is very nice, it was spotless cleaned, just normal wear and tear marks which is expected. The host provided little kitchen amenities and cleaning tools which are extremely cute and helpful. The beds are nice and comfortable and location is everything!
If you are traveling with family (older parents like I did), be mindful that the apartment is not soundproof, so you can hear the neighbours coming and going and we had pretty loud ones unfortunately. We also had an issue with a big party in one of the apartments and it was a tough night. The host was helpful and provided us with an emergency phone number for any other issues after that day but we haven't had any after that.
If you are looking for a nice location and a cozy place, I would recommend it, be mindful of the little issues and contact the host as they reply very quickly.