Never pay down a deposit in a bank account until you have met the seller, seen signed a purchase agreement.
No serious private advertisers ask for a down payment before you meet.
Receiving an email with an in-scanned ID does not mean that you have identified the sender. You do this on the spot, when you sign a purchase agreement.
1000 din. One-piece swimsuit, brand new. Size 44 (approximately Russian 52). Bought recently at Lidl for 1300 din, made a mistake with the size. Already bought the right size, selling this one. Meeting at Promenada or by arrangement in another part of the city.