The flat and our stay were good overall. I went with my boyfriend and my parents and we stayed 6 nights. The side of the apartment that has the window towards the street was perfect. All clean, a wonderful view from the balcony, very calm and peaceful. However, the other side of the apartment seemed a bit neglected - the bath tub drain was clogged, and the WiFi was very poor in that side of the flat. Furthermore, the bedroom next to the entrance is very noisy, as the window is facing an interior courtyard. A couple of the nights there was a neighbour shouting in this courtyard in the middle of the night, which can be an issue if you’re a light sleeper.
Other than these details, the flat is very nice, great location right next to Sagrada Familia and within walking distance to some attractions. There are restaurants and supermarkets right next to the flat, would recommend Oporto for a nice meal. Ester and her husband were also very helpful with tips and fast communication.