Saw it today.
It needs work. Repainting throughout. (as you'd expect)
New carpet in one room.
Ground floor shower needs some minor work. ***
Bathroom needs ripping out, and wall knocking through, so a Bath-Shower can be installed. ***
Office in rear of garden, needs insulation, electrics and plaster boarding before its useable as an office.
As part of their original recent extension, they added an additional block wall to the party wall with sound block plaster attached. As a way to add sound proofing. Which solves a worry.
Loft is massive and boarded. Could be extended into in far future if needed.
*** Would be done as part of the extension I expect.
Things to think about for sure.