Eva & Jacque's place is a great flat for a group looking to explore Barcelona. The location is very good, only a 10 minute walk to La Rambla and 25 minute walk to the beach, but it also has plenty to do in the neighbourhood around the flat. The rooftop terrace is a nice place to spend a bit of time in the evening (and is accessible by going up one flight of stairs from the flat).
You will find the rooms are a bit tight for 5 or more, but it didn't bother the group I travelled with. Overall this is a great place for a group to stay while in Barcelona to explore the city. Eva and Jacque are very responsive before and during the stay.