Overall I was happy with the apartment. It gets lots of natural light, and I loved having a balcony. Location is great - excellent public transit connections (metro and bus), easy walk to the city center and the Born. I loved being near the beach!
The place has some downsides. The level of amenity is very basic. Considering that it has a 30-day minimum stay, it's not very well equipped. The kitchen has the bare minimum supplies (plates, glasses, silverware, pots and pans, etc.) but not more than that, and some items are poor quality (the frying pans and knives, for example - and the dish towels were filthy and literally had mold on them). There is an oven, but no oven-safe dish for baking.
The hosts are responsive and promptly take care of maintenance or other needs, but impersonal and not very friendly. They really should invest 50 euros to better set up this space for comfortable long-term stays - little things like more hangers, some shelves for the bathroom, better kitchenware).