Only thing putting me off is the high mileage !
Any vehicle on 178,000 is going to need some work shortly - shafts - shocks - bushes etc, if not the engine, clutch gearbox. Also, how confident are you that the cambelt doesn't need doing? Every 72000 on a doblo IIRC.
I'd be wary. But then again a mate of mine just paid £650 for a pug 406HDi on 205,000 on a 52 plate - but he's "handy" and only does two days a week with 200L in the back so has time to fix it when it goes wrong.
If I was working 4 days a week plus I'd bite the bullet and get something decent.