Is buying a house sensible in the current market situation?!

I think it clearly sounds like you don't actually like the house and are only considering it due to lack of alternatives. You don't even have an urgent need to move. If your gut feeling advises against it, then leave it and keep looking. It may be true that you don't come out better with rent, but if you buy the house and then a better opportunity comes up in 6 months..... with a home you often can't react that quickly.

We live in a terraced end house, have access to the garden, driveway, parking space, etc. Our neighbors in the mid-terrace house have none of that. They only have a garden entrance accessible with a wheelbarrow (and are always happy when they don't have to go around but can take the shortcut through our property), nothing else. A super narrow garden, no parking space, no nothing. When I see what we always have to bring in and out thanks to construction projects in the house and garden... for me my driveway, garden access, and parking space are priceless. The neighbors also regularly park in our driveway to unload because there was no parking space nearby again. Sure, it all works, no question, but without necessity, I wouldn't choose it.

It would be enough for us if something really interesting is offered and we are not in a stupid bidding process. Here I am amazed every time when someone pays this price

Forget the mid-terrace house. You're clearly showing that you don't want it.
By the way, the investment value of the house should be absolutely secondary. You get a house because you want it. A house is a lot of work and responsibility. You have to want that. In return, you get the amazing feeling: This is MINE!
If you're only interested in the garden, get a allotment garden.

not entirely serious... one could wait until, in the current situation (covid-19), one or the other house becomes unaffordable and thus more "good" offers come in