Sorry that I can't say more, but the feasibility largely depends on the budget and structural engineering.
An extension combined with a vertical addition is ambitious for €200,000. Other people do a full renovation for €200,000 without an extension. I hope you don’t also want to renovate heating, electrical, etc. But if you see that you also want to move a (load-bearing/bracing) wall on the ground floor, it will be difficult in terms of financial feasibility. Don’t mention your budget to the architect on the phone at first. Only at the end of the first in-person meeting.