My friend and I stayed here for a month and worked remotely while exploring Barcelona! The location was in the heart of the Old City and there were so many cafes and restaurants within a 5 min walk. Everything is pretty walkable from here, however there are bike rentals and the metro nearby as well. It can be pretty noisy at night though as people leave the bars. The beds were comfy and it was plenty warm. The WiFi was strong and we had no issues working. Joan was very nice and met us when we first arrived and showed us the cute and small apartment, he was also available and nearby if we needed anything!
The big thing that got us was the cost of the electricity at the end of our month there, it essentially wiped out the 'monthly discount' that we got for staying that long. So keep that in mind if you intend to stay long. Also bring your own shampoo, conditioner and body wash or pick some up at a pharmacy nearby. It was a worthwhile stay if a bit expensive, we would recommend!