They're a a good car. Engine is fine, as above it's the Peugeot engine (DV6 by the PSA group) which is fitted to an absolute multitude of cars and vans, which is a very reliable engine.
I work for a garage which was a Ford dealer until recently, we look after no end of them and they rarely give any issues, the biggest issues are usually caused by the old biddies doing 3k miles a year, never going over 40mph or ever getting the turbo going lol. Otherwise they're very economical and cheap to run.
Price sounds reasonable if it is in good condition, the Zetec isn't amazing in terms of spec, the Titanium is much nicer, but if those things don't bother you it's not a big deal. If it comes freshly serviced and MOT'd with 3-6 months warranty then I'd say it sounds a fair price.
Only thing that comes to mind is the cambelt is due every 10 years so something to consider the cost of in a few years, but that's no big deal either.