As above, depends on spec and level of finish you want..
Interior walls look ok- maybe just windows and decoration once the wiring and plumbing has been done?
Are you looking to change the layout? Cos that’s when it’ll prob get expensive.
I bought a 100 year old tenement flat- still had the coal bunker in the kitchen!
Reasonable handy so rewired it myself but got a spark I knew in to test it all, fit a new consumer unit and tie it in to the mains, fitted a new wickes kitchen which I got a good discount on, and ended up patching or plasterboarding and finishing a lot of the walls/ceilings where the lathe and plaster was too far gone.. Got a plumber mate in to fit a boiler and central heating.. Then flooring and redecoration.
Took months of living, eating, and sleeping in the living room but got it done for about £8k. Still own the flat and rent it out now so can’t have been too badly done.
It was a major pita though, and I did take a lot of time reading up on things, taking advice where I could and getting folk in to help when I wasn’t sure I could do a job myself.