Pros: Check in was easy. The flat was clean and located in the center of everything. We walked to Sagrada Familia and Picasso museum. The host responded fast and provided us with all the info we needed before our arrival.
Cons: There is no shampoo, conditioner or body wash for guests to use. At least we couldn't find any. Also, it'd be nice if the host can provide more comfortable bath towel for guests.
But I will totally recommend this flat to anyone who visits Barcelona.