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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.
But let me be blunt about the rough edge of this lifestyle. That foam mattress from the sofa bed, usually a standard 16 centimeter job, tends to slide. If you have a slippery floor, the whole construction shifts during the night, and you wake up with your head against the baseboard or the mattress hanging off the frame...