I stayed almost a month in Sven's flat in December-January and I wish I could stay longer (but my holidays have come to an end:()! The flat is perfect, the kitchen has all the equipment (even a dishwasher), there is heating, intenet is fast, a lot of space and light coming from the kitchen windows. The location is also very good, 2 metro stations are really close by and you can also walk to Plaça de Catalunya in 20-30 mins. Gracia is one of the bast areas of Barcelona, it has all sorts of cafes/restaurants, supermarkets and small shops, theaters, cinemas. It feels very safe as well, as a female travelling alone I never felt uncomfortable coming back home in dark hours. If I come back to Barcelona I will no doubt want to stay in Sven's flat again.