The house definitely needs a visit from the house doctor.
Main pic: - The windows are totally wrong for the age and style of property but obviously they aren't going to rip them out and replace them.
1st - Clutter needs to be cleared away and the pink curtains and accessories do nothing for that room
2nd - the back wall would be better painted white, the brown adds nothing.
3rd - maybe a few plants in bright pots and a table/chairs/parasole?
5th - could do with a tidy or buy a bigger tablecloth to hide all the stuff that's currently underneath the table.
6th - pic would have been better without the plywood at base of stairs
7th - pic is at a strange angle but I see there's a better one.
9th - not sure what you could do in the bathroom.
10th - steps at back and front of house, not great with young children or anyone with a physical disability.
12th - I would have taken up the play mat in front of tv
The two things that would put me off from viewing let alone offering are the windows (would cause a big upheaval and cost a lot to replace and the stairs (I'm disabled).