Really hard to find anything wrong with Casa Cosi. Firstly the location is very good, the area has so many friendly bars, restaurants and bakeries. It is a small walk to the main areas but through nice neighbourhoods. The apartment is actually bigger than it looks on the photos, very clean and comfortable and we didn't hear any noise really from the road or neighbours. We had a small issue checking in but it was very easy to contact the owners and they were very attentive and very quick to respond and resolve issues. I would 100% stay here again when visiting Barcelona.