Great apartment and great street. It looked freshly decorated and very clean. It has two bedrooms, one with a double bed and one with two singles which were very comfortable. It also has two identical bathrooms which are right next to each other. We thought this was a bit unusual but hey, we're not complaining!
We also loved the street. On the first evening we found a great burger restaurant a few doors down, Santa Burg, we liked it so much we went there a second time. There's a bakery opposite and a couple of small supermarkets and numerous other shops, bars and restaurants. The nearest metro station is about 2 minutes walk and Sants mainline station about 3 minutes (make sure you use the exit which has dozens of taxis outside, not the one that has the big square out the front).
We also thought the apartment was good value for money compared to others that were on offer and it has super fast Internet, over 300mbs.
We loved staying amongst real Barcelonians and not being in the tourist district.