Joan's place was very clean and had plenty of room for two. The kitchen is very nice and the balcony was perfect for enjoying the perfect Barcelona weather and city sounds. We pack light but it was nice to have a bunch of closet space to keep our stuff out of the way.
Gracia is a cool neighborhood with lots of good coffee shops and restaurants if that's your thing. Casa Mila and Casa Batllo are easily walk-able in the nearby Eixample neighborhood. Everything else is easily accessible with a T10 card for the metro.
We would definitely stay here again the next time we're in Barcelona!