Probably just another vacation / hotel / flight scam.
OP created a brand new account just to list this service
.
There simply isn't the markup on stuff like this for anyone to get it legitimately with such big discounts.
Also by paying with untraceable btc and the seller only advertising a gmail email address this seems very shady.
Also even though escrow is offered the only safe way to use it would be that the OP isn't paid from held escrow until after the vacation / hotel / flight which is very unlikely to be allowed to happen.