We visited as a family of 4. It was perfect for what we needed. It is in a great location with a lovely bakery/cafe opposite which was perfect for breakfast. Salida Familia is about a 10 min walk and only 2 mins to the Sant Pau metro station. We brought a 10 journey ticket each and used that.. there is not a discounted card for the children, I think under 2s travel free but it was cheap as chips and it’s a good service!
The kids loved the quirky lift, you feel like you are really staying in the heart of Barcelona. The room is very modern with a little balcony. Our only qualm was the housekeeping. 2 toilet rolls for a family of 4 for 4 days was not enough and we could have done with some clean towels half way through.
The check in was seamless and the staff great. They organised a taxi for us to take us to Airport (which cost around 35 euros).