This is a SCAM. While we were in the US and looking for a flat in Zurich we were asked multiple times to send deposit via Western Union and as soon as I start questioning then why and what have you... that it has to be through WU... I would hear all kind of silly excuses. The best one "My trusted friend who has keys for the flat is presently not in Zurich and it is costly for me to fly there to show it to you" hahaha, very clever.

Don't do it! You will never see your money again!