I looked at the house, so for 340k I would buy it too and rent out both apartments.. :D
You don't have to do anything on the ground floor. Upstairs, yes the bathroom, you can count on 10-15k, then maybe 10k outside. and maybe here and there another 10k... But how do you get to 75-100k that you have to invest there?
The only thing you should do is the bathroom upstairs, but you’re covered with 10-15k there. If you do it yourself then easily 5k... Don’t let you regret it later....