The location of this unit can't be beat. It's right at the heart of old Sevilla. The size of the unit is adequate for a short stay by a single person or couple.
One thing that can be improved is the check-in process. The host should not wait till the arrival time to communicate directions, building codes and how to operate the tiny and highly unusual elevator. All this should be comunicated to the guest ahead of time, so they don't have to keep checking their messages on the morning of their arrival in Sevilla.