Council tax banding, ask them what band they are, check for damp, mould on windows etc.. general decor, surrounding area, like the others have said, check out the neighbours, and have a walk about.

We looked for months, and totally sussed the area out before even putting a bid in on our first house last year, and im so glad we did, couldnt be happier..

all depends on your budget really.. we didnt need to do anything a such to ours, it was really well decorated new carpets etc/... its just things like that if you are thinking of replacing that will cost £££'s further down the line.