That definitely fits. I also don’t consider €500 for additional costs to be set too low. We have that too, although our property tax is quite high and really everything (including [GEZ], [Telekom], garbage disposal, heating maintenance, chimney sweep...) is included in it.
You also have a decent buffer for all those things you only realize you need when you own a home, like gardening tools, garden furniture, furniture suitable for a bigger house, etc. You really don’t have to worry about that.
The only point is about the company car: I also have a company car and since I have a 30 KM commute each way, the amount I have to pay in taxes as a monetary benefit corresponds pretty much exactly to the amount I would have to spend maintaining my own vehicle. Just do the math to see how much it shifts net in your favor because of the company car. The gross list price of a solid A4 or something like that is not exactly low either.