Hi I have the chance of buying a 2002 giant lafree Twist I know it's old but are they any good
It depends what you want it for. I know a few people that found that they work quite well as a garden trellis. Others use them as a decoy bike. You put your normal bike securely locked in the shed and a Giant twist in the garage.When the stupid thieves brake in, they don't know what it is, especially if it's dark, so they steal it and leave your other stuff alone. That normally works out cheaper than insurance.
My advice is that unless you like the advice above or you just want a project and don't care about how much it costs, keep well clear of it. The battery is probably knackered, so a fairly expensive repair might get some life out of the bike, but it's under-powered compared with modern bikes - better than nothing, but not by much.