Starting with the few negative aspects, and neutral aspects that future guests should know about:
There is a bit of brown mold at the entrance, far away from the bed. This is not a big deal, most hotels have mold. However, the mold here was large and very visible.
The wifi is slow and disconnects frequently, I do not know if that's the fault of the host or the building so I did not remove a star.
I had a cockroach for a roommate, I did not kill it.
There is no oven and the mini fridge is too small to hold many ingredients. It is like a hotel room in that regard, I did not expect to be able to cook here.
There is a washing machine but no detergent is provided, it seems wasteful to have each guest buy their own detergent and having the rest of the bottle go to waste if they can't bring it with them. It would be better to provide detergent and account for the cost of it in the price like it is done for body wash and shampoo.
The neighbours are birds, I hear them chirp all evening when I am in the bathroom but I do not hear them in the bedroom, so it was fine.
I am not removing a star for anything but cleanliness due to the mold. Everything else is either nice to have but not expected or something I didn't give the host a chance to correct while I was there because it did not bother me personally.
Everything else was immaculate. The design of the stay was as beautiful as the photos, and Triana is a great neighbourhood with cheap restaurants, great nightlife, and very kind people. There is also a 24 hour front desk to assist you. I paid $75 CAD per night and you will not find a better deal for such a unique stay close to the centre of Seville.