The Blue House Hostel is a hotel aimed at kitesurfers. I have no interest in the sport, but I really enjoyed the atmosphere. There's good music by day, and it's calm at night. There's no hot water, but the truth is that it's quite normal and you won't miss it in the heat of Cartagena. A very pleasant place to stay in the heart of the walled city, with charming staff and good prices. Highly recommended.