They will force you to pay a deposit over £100 through a unsafe website other than Airbnb, and if you don't do so, you will not be able to enter the flat. You will also be forced to send them your IDs(both sides), show up your DOBs, your address and zipcodes, your personal privacy will be greatly compromised. I don't know if they will refund the deposit yet, what I can say now is very ridiculous that this flat is freaking nowhere with very small usable area, very far from city center, very cheaply furnished, very unstable hot water. I've stayed in some Airbnb's places with experiences comparable to Hilton or Hyatt, but those hosts didn't make any additional requirements like send your IDs and deposits. Does Marvin worried about your guests stealing your worthless furnitures? Your bathroom is so tiny that even hard to turn around in it. Definitely one of the most horrible places in Airbnb