We actually did not meet Luis.
We checked in just before 11 pm on a Friday night ( + paid the extra 20 euro fee + tourist tax) and a lady called Marianna who was communicating with us while we were traveling to the property was waiting for us in the office (this is some sort of a letting agency) below the flat.
She was very polite and brought us a set of linen which was missing for the sofa.
This is a pretty comfortable flat in a very good location but for the money asked there could be some touches added which could make it a bit more modern, cozier and arty instead of leaving the impression of being assembled in an economical fashion... which is not bad but the price should be in accordance.
The bed linen and some of the bath linen could be upgraded too.
Saying that there is everything necessary one may need for a short stay.
There is plenty of storage space, the kitchen has almost everything a kitchen may need (apart from hand soap and sugar perhaps).
We were very pleased to find some variety of tea and coffee :-). Thank you very much for it!
No issues with the bathroom despite its small size.
We were surprised that we had to look for rubbish bins in the neighborhood in order to throw away our rubbish from the flat on check out as requested. It was not a big deal for us but for the price paid, this surely could be omitted.
And, of course, the noise during Friday and Saturday night ( until 4.30 - 5 am ) from the parties within the building and in the neighborhood - it left us ( with a child on board) pretty tired during our short stay in Barcelona.
This is not a critic or complaint but a constructive review which aims to help the hosts with their future business.
Thank you very much, Luis and Marianna, for your prompt communication with me!