Our family (2 adults, 2 teens) stayed at Ramon's place for a 3-night stay. It was the perfect place for us. It is clean and we felt right at home. Everything you need is there from a washing machine to hair dryer to spices in the kitchen, and even a scale to weigh your luggage. Wifi was fast and solid if that is important to you. This place is truly a home away from home.
The only caveat is that the stairs to the apartment are quite narrow and the elevator is pretty small. That was not a problem for us though.
The location is nice and close to the Lesseps metro station, a supermarket and several restaurants. It's also in walking distance of Park Güell, which is worth a visit.
We had some flight troubles and our arrival time changed several times, but Ramon was very accommodating and flexible. Very fast response and super helpful. It felt like talking to a friend.
Next time we travel to Barcelona, we'll be staying here again.