Ewa & Pau's place is tad bit small for four people, we traveled with two kids, we got used to it after a day and overall we have a awesome time.
Vicent was waiting for us at mutually agreed time at the apartment and gave us keys to apartment and tips on Barcelona visit. Connection from Airport to Apartment was very convenient, as Vicent suggested we took Airbus from airport and it was 30 minutes drive and walk from bus stop to apartment is 2 minutes. If you come early or late flight, there is a left luggage place next door to the apartment.
Vicent was very efficient and quick in responding to our text messages. The location of the apartment, you cannot ask for better location, it is right in heart of the city center. Lots, lots of eating and shopping place around. I highly recommend Ewa & Pau's place.