I would have never mentioned this unles this would have been a first-hand experience or something I would have had any doubts about. I booked an apartment in Kyiv, but instead of that I was sold a phone number of some girl "who might help me find something". Such phone numbers are abundant on any crossroads in Kyiv for free, with much higher chances of accomodation.
I was just fully refunded for this incident, but it was also mentioned that this was kind of exceptional and one-time-only. As I understand, refund rules chosen by the "host" apply usually, so I would advise to take good care before booking apartments from people with low or non-existent feedback. Unfortunately, the system for filtering fraudsters is nominal at the very best, if existent at all.