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.
3 SHELL RENTAL UNITS FOR SALE AT KITENDE KIWAGUZA TOWN VIA ST MARY'S SCHOOL ENTEBBE ROAD. 2BEDROOMS, SEATING, DINING,KITCHEN AND TOILET ON 13 DECIMALS MAILO LAND WITH TITLE AT ASKING PRICE 200M NEGOTIABLE.