The place was very much as described in the listing. There was enough storage space for all my clothes, and even enough space to do some light exercises. The chair was comfortable and the desk big enough to do actual work on. Overall the room was great, but do note that the door cannot be fully closed, and there's a slight slit through which you can see the back end of the room. I didn't consider that a problem though, as you rarely stand there. However, sometimes a gust of wind may blow it open a bit, if you have the balcony door open.
The host was very helpful and responsive and met me to let me in, and helped carry my bags as well.
The location is a bit on the outskirt of Barcelona, but there is everything you need nearby. A great selection of restaurants, supermarkets, etc. Many parts of the city are within a walkable distance, and I was overall quite happy with the placement.
I had a great time staying there and can genuinely recommend this place to others.