I cannot praise this flat enough.
It's located in the middle of the old town, with a view of a very nice and tranquil square. All that you could need as a tourist is less than a 10 minutes walk away. Museums, restaurants, bars, parks, little local shops (with souvenirs, or local clothes and shoes - which i greatly recommend!).
The flat itself is furnished with everything you could need, even if it's a longer stay. I especially like the books, all of which are about Girona and the surrounding lands. It's also decorated really nicely (we spent so much time looking for some of those posters in the shops!).
All in all, a 10/10 stay.