I stayed two nights at Karla's place. The communication and check-in was super easy. I messaged Karla on WhatsApp what my arrival time would be and she responded really quickly. The place has about 5 rooms, each with 3-5 beds - so it is a hostel-style accommodation. Unfortunately, there is only one bathroom for a lot of people and also plugs are very sparse - but this maybe a more common problem in Barcelona. Overall, Karla was super friendly and helpful and the place is great to meet people! And the huuge terrace is lovely :)