This apartment was lovely! We went to Barcelona to spend a week-end and we have mostly walked even if the apartment was near to the transports (2 metro stations) The location is good, close to the historic center of Barcelona, also 10 minutes away from the Plaça Espanya where you can take many shuttles and buses to go to the airport!
Alan is really nice, we didn't get the chance to meet him but he was always available to answer to any of our questions!
The lady that came for the check in and check out only speak Spanish so it was a bit complicated to communicate but she was very nice!
I definitely recommend this apartment for a group of friends or even a family!