Don’t get too hung up on minor cosmetics. If you like the size, character proportions and location of the property but it needs work then offer accordingly. Cosmetics can get sorted. If things start moving forward get a good survey done. That will pick up on everything, including sealant around the bathrooms and kitchens, and if it does then use it to drop your offer further to reflect this.
If they don’t go for it then weigh up you options and either stick or twist. You’re buying a house, surveys may cost money that you don’t really want to spend but, if anything they are good bargaining tools.