We had a wonderful stay at Elena's house. She was very kind and helpful to inform us were to go, besides the places we already booked in advance. The room was very clean and we could (and did) use her kitchen, which was easy for preparing breakfast. The location of the appartment is on walking-distance of a lot of interesting places to visit. And for dinner several restaurants at at a 15 min walk. So is the metro if you'd prefer that. We'll surely book again at Elena's when we get back to Barcelona. @Elena: thanks again!