The flat is owned by a letting agency, not Luis. We didn't even meet Luis. The flat itself is fine and it's in a really good location.
However, the letting agency tried to charge us extra in cash on arrival and then continued to message us throughout the trip telling us to pay them more money. Every person from the agency asked us for a different amount. They fell quiet when I showed them the terms and conditions of Air BnB.
This was a real trip-ruiner for me - particularly horrible receiving threatening emails on my birthday. A real shame, as I have never even left a negative review before.