Hi Liam, thank you very much for all the detailed comments and suggestions. There's actually a movable grill inside the cupboard in the living room. I normally don't take it out, as it needs some work to be well cleaned after use. Of course I would have been happy to point it out for you.
Concerning mosquitos, in June, July and Agoust the village gardeners spray anti-mosquitos substances within the entire village, so there aren't mosquitos at all. I guess they do it less when most of the people leave. Antimosquitos candels are available in the entrance cupboard anyway.
I will not forget to give all these extra informations next time!