Of course, the terraced house is much more efficient than the detached single-family house. That does not mean that detached single-family houses should be banned, but doubting the higher efficiency of a terraced house is already absurd, almost like a religion...
However, I also see coal critically at the moment. 5,400 bad guys per month sounds like a lot.
I have that together with my wife as well, plus a company car with private use; in "good" months with a lot of foreign trips (expenses, overtime pay, bonus for field work) it's sometimes even more.
And I wouldn't dare to take on a rate beyond 2,000 EUR. There's simply too much left out when 2,500-3,000 big bills go every month just for the house.
If it's planned that the wife will also return to work, then it's a different story. But it will be difficult; I hardly believe that a senior physician goes home relaxed after 8 hours or 40 hours a week.