This is a gorgeous and comfortable apartment in Barcelona, highly recommended. It was one of the smoothest check-in/check-out processes I’ve encountered, the location was absolutely perfect (exciting and pretty area), and everything about the place was functional and tasteful.
By now you’ve read enough about the stairs to know that they are notably narrow and take some work to navigate, especially with luggage. If you are traveling light and have no significant mobility issues, they are fine. But they would be challenging for my older relatives, for instance.