We have a 2litre, bought new in 99 and it has done 150,000 miles!
Easy question first-seats should either come out totally, or fold forward leaving a biggish space in the boot, or fold in half but they are not flat -ie level with the boot floor.
Ours has been ok, it has needed a fair bit of work done on it though.
We have needed an engine rebuild (@64,000 miles)(our fault as did not replace timing belt in time, but only 2000 miles over recommended mileage change), new gearbox @80,000), new exhaust and catylitic converter(replaced in sections between 100,000 and 140,000) and new motor for electric window winder. Also had a starter problem and needed some sort of switch fitted which was apparantly very common.
It also has problems with water coming through into the car.
My sister had a 1.6 model and had quite a few problems with it ,ending up scrapping it last year.
On that basis it is hard to advise you to go for it! But ours is still driving,aircon,cd etc still work fine and it has had a hard life! Depends on how much they want for it and condition etc.
HTH.