Adriá's place is the perfect distance from the city center to be easy and quiet when you need to and close enough to all the fun that the city offers. It's also within a few steps from the train station that you'll appreciate it if you're carrying lots of bags.
Adria's is a great host and will make you feel welcome instantly. I had a long weekend stay in Girona and Adriá knew how to balance offering enough advice and not getting in the way. I would stay at his place again in a heartbeat!