The flat was really nice, extremely well equipped with everything you need (washing machine, dishwasher, even a dryer). It is located in El Gotico, in a small street without any bars or restaurants directly below, which kept the amount of noise to a reasonable level.
If you're sleeping in the room that faces towards the street, have earplugs handy though (the skateboards can be pretty loud in the narrow streets).
The style and decoration of the flat was really amazing, cosy and not tacky like many other places in Barcelona. Enjoying a coffee on the small balcony was a daily highlight, the views into the street super charming. The check in worked perfectly. The WiFi was also great and offered enough speed for having multiple videocalls simultaneously, so we could work without any problems.
One more kitchen towel would've been good to have, but that wasn't a problem since there were plenty of paper kitchen towels.
Thank you casa cosi for having us, would always come back!