-
It's good that you've got a potential neighbour who have been along a journey with their place - you can ask them who did what and have a ready source of recommendations. You don't have to trust them (they might be clueless) but it's a better place to start than from nothing.
Same as everyone else, you could turn it in to a nice home with the money and some knowhow. The extension thing next door is something you can't really sort out though, so you'd need to take that in to consideration.
Neighbours one side clearly spent cash and have recently extended. Other neighbours looked nice our front but can't unsee that flue