Luis hosted my friend and I while we stayed in Seville for a couple of days. What a great city, and the location of the apartment is perfect - very close to everything we wanted and needed to see (we walked everywhere), yet the area is far enough from the center that we felt we got a good taste of the local neighborhood as well. Luis was extremely well-organized and knowledgable about the city and the area... He pretty much mapped out our stay for us in terms of sights to see and places to eat (gave the best recs!!). We had a great, thorough experience in the city and we definitely credit Luis for that! His living room has plenty of material about the city. In the kitchen, he allocates a shelf in the fridge and the cabinet for each room's stuff. The rooftop terrace made for an adorable night cap spot. And has lines for drying clothes that I was able to handwash!
For all intents and purposes, Luis made an excellent host. However if you're looking for someone who is more of a warm and friendly and talkative host, he may not particularly be your guy, as he seems to mostly keep to himself and stay out of your way.