What ceiling heights do you have on the upper floor and what roof overhang? The windows don't look huge now either. It somehow looks a bit strange. In my opinion, it is your fault anyway. You handle the tendering and awarding of the contract. A note from the carpenter that the result wouldn't look impressive would of course have been sensible. Thinking ahead is what distinguishes good craftsmen from bad ones.
what is the carpenter supposed to do, really? here you would have needed a storey increase, which is usually absolutely necessary with [Rollläden] (or with some companies it is already included in the price). a city villa with less than 2.50m finished room height on the upper floor is pretty low.