When you go to look round, rely a lot on your sense of smell. a building that is damp smells. If there are air-fresheners in every room, wonder what smell they are trying to cover up.
Look in the corners of rooms for black spots or staining, most of the time that's only due to poor ventilation. Look for wallpaper peeling off and signs of loose plaster. If it's empty, tap the walls lightly, a hollow sound suggests loose plaster.
Go outside, look at the top of the roof, (ridge) is it straight. Is there grass or plants growing out of the guttering?
At ground level can you see a damp proof course, are there salts coming through the mortar and bricks, what sort of windows are they and are the frames fitted properly. Is it rendered, if so are there any cracks.
Is the drive flat or are there puddles when it rains, does it slope towards the house?
How old is the property? If you do decide to make an offer, be sure to get a full structural survey done so you know whether something's cosmetic like condensation, or if it's going to cost a lot to fix like damp. Some damp proofing smells so bad you need to not sleep in the property for a few days.
Where are the boundaries, which are the owner's responsibility, which are joint, which are neighbours'. Is it private or do neighbours have rights over it?
Nothing's insurmountable, but you do need to know initially if you can take it on as it's easily manageable, or whether it's a massive 20 year renovation project where you'll need to live in temp accommodation for weeks at a time while the work's being done which will eat up all of your spare cash.
There are a lot of rules and regs now on DIY restorations and future buyers will want to know if there are certificates of competent installation e.g. for electricity and gas and any guarantees on things like damp proofing, double-glazing, DIY extensions etc.
It is fun to do up an old place but it costs at least twice as much as you think because you want to do Job A, but you have to do Jobs B, C. D, E and F before you can do Job A. And it always takes much longer than you'd estimated.
Enjoy looking round, then if you're drawn to it, look around with a bit of knowledge about renovating property and see what you think.