We stayed at Dolors' big apartment for almost a week with a large group of 13 friends and we all enjoyed our time.
If you don't know Barcelona though, be warned that the place is located a bit far away from the city centre, in the hills right next to the Parc Guell, so you'll have to use the metro and taxis all the time (but that's always the case in Barcelona).
Also, note that there are only 12 real beds (located in bedrooms), so any other guests will have to sleep on a couch. And the free parking is really difficult to use (tight and steep). But that is about all for the negative points, which are always more helpful in a comment section.
All the rest was excellent, the facilities are great (showers, kitchen, furniture), the garden is really enjoyable and Dolors was super nice and available. You definitely get what you pay for!