This is a really fun and amazing apartment in a fantastic location in a great city. Esther's description is accurate. Read it and other reviews carefully as the many stairs, small size, and funky nature make this place unique and not well suited unless you are fit and agile. That said, it was perfect for us and we loved it!
We did not get the opportunity to meet Esther, but she was very responsive to the few questions we had via the app. She was out of town when we arrived, but seamlessly coordinated our check-in by having a friend meet us at the door (accommodating our late flight arrival very nicely). When I asked about a taxi back to the airport at 4:15 a.m., Esther just make the arrangements for us, which was above and beyond in my view.
I highly recommend this apartment for the person who wants a fun and unique place to stay in the heart of Barcelona!
Jim