My friends and I stayed at Silvia's for the Primavera Sound and we loved it. Silvia is very friendly and attentive host. We had the whole house to ourselves including the cute courtyard with the mandarin tree to enjoy our morning coffees and evening cavas. The flat is super-convienently situated – supermarket and metro stops are just around the corner. The neighbourhood is very quiet. We all definitely recommend staying at Silvia's if you end up in Barcelona.