I stayed with Carolina and her partner for over a week and had a very pleasant stay. The apartment is beautiful and fully equipped, and the guest room is super clean and comfortable, with separate window, heater, working desk and closet. The apartment as a whole is sunny and spacious and you are all alone during the day. The guest room is also right next door to the main entrance and the extra washroom. It's a perfect blend between privacy and a hospitable shared accommodation. Carolina and her partner helped me out with all my questions about Barcelona, and shared many enjoyable conversations. Location is about as central as you can get and right across from the Metro station.