Hello Elena
Same problem here, it just happen from a country couple of mine, I guess intercating with them was not the best decision. They were French, like me, drove them around, paid for dinner, they said"""you have been fantastic, will write you a great review, bla, bla, bla,..."""prior to leaving they said they would write from their cimputer because it was not easy to write with mobile, I asked why as he was retrieving his mail via mobile (maybe I shouldn't have asked??? ) he said better wait until they got back home, when they arrived back home they send SMS via mobile, answer them, remind them about the review, they stop answering sms and or e-mails, they complete ignore me, that's pity, I try to contact AirBnB to see if we can get any ratings if guests don't send review but still no answer
Unfortunately we need reviews to get bookings!!!!!!!!!!!!!!!!!
Have a nice day
Manu