We very much enjoyed our stay at Gianluca's place. The house is very beautiful and typical. Gianluca is truly an amazing host, I think probably the most responsive, helpful, nice and thoughtful host I ever had on Airbnb. Just two of many examples of his thoughtfulness is that he left a few snacks for us in the fridge because he knew we would be arriving late, or the fact that he let us stay in the house longer as we had a late flight back home.
The small drawbacks of the place are that it was a bit cold when we were there (around New Year's eve) because there is no central heating. However, there were electric heaters in every bedroom so we were not cold at night. Since the house is not super well insulated, you can also hear the noise from the streets (cars honking for ex, which happens a lot, or noise from the harbor) and the beds are not very long and have bars so if you are tall like one of our friends, you might have a little bit of trouble fining a comfortable position to sleep.
Also, you should just know that the house is located in a fairly quiet area, with not many bars or restaurants nearby (there are a few, but you are not in the center of Valetta for ex). But this area is very nice and authentic, so overall we were glad to stay there as well.