We loved the flat, we felt like living in a typically house from barcelona and being really part of the city. Moreover the badroom is new and very clean. In the kitchen you can find whatever you want to cook whatever you want :D sometimes you hear a bit of noise late in the evening but it stops ar night. We slept very well! Big heart crush for the Gracia suburb where the flat is situated <3 a lot of little sweet bars and restaurant, everybody is kind and willing to help you if like us your spanish is very poor ^^ as mentioned in the comment before you have to plan additional costs for the city tax,which increased from some euros in the last month. But affordable, no reason to worry about it.
I definitively recommend the flat and Luis as host, who enjoyed us from some additionnal insider tipps.