@David6
idiots! they extinguished cigarettes on the PVC window frame! Jesus!
The truth is - smokers will always smoke. On the window or in the backyard, or, if they really don't care - inside. So I would recommend to all hosts to leave an ashtray somewhere, it's better if they use it than to do what they did to you or to throw cigarette butts in the yard or even more dangerous - in the trash can.
We allow smoking inside, we have an ashtray in the apartment and outside on the staircase. In three years of hosting, I've sent a smell just once and it aired very quickly so the next guest didn't sent it
Most of our smoking guests don't smoke inside or do it on the window and we didn't have any damage done by smokers yet. Most of our guests are nonsmokers and I am sure they don't even know they are staying at the place where smoking is allowed.