Not.
Use eBay classified: runs for 28 days, about £20 and no other fees. No-one can mess up your listing by hitting the Buy-It-Now, just as many pics, just as much description. Classified allows you to put your phone number in. You can then say all communication via phone number please. That'll get rid of 98% of all messers and low-ball bidders.
Ignore all messages unless they stand out as being particularly well written / spelt etc. Ask this: why would any genuine buyer that wants to drive out and buy a car NOT want to phone you? Surely they'll want to have a natter, sound you out etc before committing their time?
Deposits: I now don't bother. They cause more trouble than they're worth. Better to leave the pressure on the buyer: 'sorry I can't take a deposit and it's first come first serve as I've had so much interest'. I will hold a car if they say they're literally leaving now and the journey is, say, two hours. I'll never hold a car 'until the weekend' or whatever. If they really want it, they'll find a way of making it happen.
If I may critique your eBay ad:
1) You get twelve pictures, use all of them.
2) Never say you've been let down by others: whatever the reality, it simply implies others have been out and not bought for some reason.
3) You say it's had paint, but don't say why. I'd underline the fact you had paint to 'bring it right up to lovely condition' or whatever. As it stands, you might well have needed the paint because you crashed into an oak tree: the buyer doesn't know.
4) Because you've mentioned paint I'd mention that it's HPI clear (I assume it is).
5) Don't mention your age: you're just asking for people to scam you.
6) Be welcoming in your ad: there are loads of cars out there so buyers are more likely to go somewhere that makes them feel as though they're not a hassle / burden etc.
7) I'd also collect the positives into one area and the negatives into another. This makes it easier for a buyer to get things straight in their mind: it's got this (good) but it's got that (bad).
8) You don't mention MOT? BTW, MOT's 'run until xxx', they never 'expire at xxx'.
9) Any options?
10) I like to divide my ads into an intro, the positives, the legal bits and things that come with it, then any negatives. Finally a word about viewings and making contact.
If I may, and purely out of interest, here's my version for what it's worth:
Audi A2 which we have had 15 years, now replaced with another one! It's been brilliant: reliable, very economical and just £30 road tax.
Over last 12 to18 months it's had: full service, full cam-belt kit with water pump and coolant. New battery and 4 new tyres. Clutch was replaced at 100K miles. MOT runs until xxx
We've recently spent £600 on paintwork to tidy some blemishes as were keeping long term and then, by chance, saw and bought a low mileage A2 last weekend.
Comes with V5 in my name, full hand-pack with service book, one key (remote, works) and all tools. Hpi clear.
A couple of things to be aware of: some of the presets on the stereo sometimes stick, and the starter motor sometimes makes a funny noise. This is well known in A2 circles and doesn't affect the operation or life of the starter.
Hoping to sell to someone that appreciates these wonderful cars. No offers unless you've seen the car first hand thank you, viewings very welcome.
Please phone 07700 123456 for details (your mobile number).
Don't use landline and like messages, ignore texts unless particularly well written. Even then, just ask them to call 'when they've got a minute for a chat' otherwise you get into a never-ending stream of individual questions and then usually, either a fantastically low offer or silence.
Anyway, these are just my thoughts as someone with some experience of these matters: hope at the least it's of some interest!