Enrique's appartment is in the best location I could think of after getting to know Barcelona. Gracia is an amazing neighborhood.
The appartment was not quite as advertised - it's two double beds in a single room - but I'd recommend it in a heartbeat to any group of people knowing each other closely... but couples should really know each other closely... or have a good schedule... or be very, very patient :-)
There's a tourist tax that wasn't mentioned as far as I remember - 49,60 EUR for 4 people for 5 nights.
Still, the appartment is amazing - it is clean and pretty well equiped.
Garth (who greeted us and showed us around) had some amazing tips for us and we felt right at home. Communication with Enrique was amazing, too he's a very helpful host and offered to book tours or buy tickets for us.
Stay U-nique indeed!