The place is exactly what someone might need for a few days of exploring Sevilla. It has all the basic amenities that you might need and most importantly it's in a great location, straight into the heart of the city. Luis is quite helpful and genuinely tries to accommodate guests. Good value for money!
The only negative that I can think of is that the building is not soundproof at all, which depending on the neighbours' mood for noise, can be a big issue. Also, the external doorbell was ringing from time to time without anyone answering, not sure if it's a technical fault or pranks or people trying to get in the building. If you experience this, just disconnect it, and you will be fine :)