My cousin and I visited during our trip to Spain. Our flight was delayed and we arrived late. I will note that the posting states 24 hour self check-in but this was not true. Joseph had to allow us into the room when we arrived.
Upon arrival, we were greeted, shown our room and explained the rules. Some house rules were in the listing description, but others were not, such as for example, needing to take quick showers and the tendency for the shower to flood the bathroom and needing to mop the water in the case that the water overflowed.
The room itself was very small. While the posting stated a 100m2 unit, the room itself was a small portion of the overall space (I'd have to guess no greater than approximately 25m2) and very tight for two people with luggage. The portable AC (not shown in the listing pictures) also occupied a portion of the already small room. The windows had to remain open for the AC to operate, meaning noise from outside was audible throughout the stay. The shared spaces also had no air conditioning.
Very little natural light flowed into the space, and Joseph had asked for shared lighting only to be turned on when absolutely necessary. This gave the space an unwelcoming feel. We were also asked to remain very quiet at all times. Overall, the abundance of rules complicated the stay and made it feel uncomfortable (while I understand the need for rules when staying at another person's home, as a person on vacation looking for simplicity and relaxation, it was an added challenge I wasn't looking for).
For the amount paid ($275 CAD per night for two nights), we were quite surprised with the experience. I take some fault for not looking more carefully at the listing before booking, but I also believe the posting is somewhat misleading with its angling of photography of the space and what isn't accessible (e.g. the bar, one of the bathrooms, "building staff"). For less money, we decided to leave the booking and reserve Seventy Barcelona (a hotel near the center of the city) for the second night, and had a much more enjoyable and comfortable experience.
I would expect a place like this to charge no more than 50-100 CAD for a night, and at this price, I think it would be a good spot for a single person to visit between stops while travelling. For 275 CAD, it makes much more sense to book a hotel.
Joseph was sad that we chose to leave and offered us free stays at other places he runs if ever back in Barcelona. Joseph was a kind host but unfortunately irrespective of his hospitality we didn't enjoy our stay.