The broker does not take a clear stance on financing. How to behave?

This way, you can only "offer" what it is worth to you and what you can afford. And hope that the circle of interested parties is not too large. But it doesn't seem to be the case here & with the amount. Try it out, and despite everything, see it as a game. A pretty nasty game, very costly for you, but still - otherwise you will just despair. Unfortunately, there is always a fool who spoils the prices.

I was the first and wrote the acceptance by email directly in the evening. Then I called in the morning and asked if the email had arrived. He just said that he has so many inquiries that he doesn't even know how to handle them all.

I will translate: "We have so many interested parties that from the broker's and seller's side a higher purchase price (=a higher commission) seems quite feasible, and for this reason we can only stall for now."

Unfortunately, there is always a fool who ruins the prices.

Usually, it is not a "fool," but someone who simply "wants it very much" and is willing and able to deploy more resources for it. So you offer your price, engage in "human engineering," or simply keep your distance from the matter.

This way you can only "offer" what it is worth to you and what you can afford to provide. And hope that the circle of interested parties is not too large. But this does not seem to be the case here & with the amount. Try it out, and despite everything, see it as a game. A pretty nasty game, very costly for you, but still - otherwise you'll only despair. Unfortunately, there is always a fool who ruins the prices.

I find this victim mentality disturbing. Put yourself in the seller’s shoes for once.
Doesn’t he experience a nasty game when the house is bought away after half a day and he obviously gets _too little_ money for his property?
Do prices get ruined because we are moving in a seller’s market?

Why do buyers assume as a matter of course that they can negotiate the offered price down, when at the same time it is not legitimate to also adjust the price upwards if corresponding demand is noticed?
A house is not a yogurt on the Aldi shelf, which is available in multiples and marked at a fixed price to be sold 200 times a day.

I find this victim mentality unsettling. Put yourself in the seller's shoes for once. Does he not experience a dirty game when the house is bought away after half a day and he obviously gets _too little_ money for his property? Do prices get ruined because we are in a seller's market? Why do buyers take it for granted that they can negotiate the offered price downwards, when it is equally illegitimate to adjust the price upwards if there is corresponding demand? A house is not yogurt on the Aldi shelf that is available in multiples and marked at a fixed price to be sold 200 times a day.

As far as I know, the original poster is an educator who no longer gets anything in her region in SH because everything is being converted into holiday homes. I don’t know how Hamburg influences this. But since Corona, everyone knows what would happen if educators enforced their market power through a strike in the same way. It may harm society, but it fully aligns with your attitude. Housing and living are not simple dairy products, and reliability is also a value. Or would you like it if the taxi you ordered to the airport, which cannot be substituted, informs you that there are now more interested parties and if you don’t want to miss your flight, you have to start bidding? And the airline and later the hotel likewise? And yes, greed and black money certainly ruin prices...

If I were you, I would simply offer what it is worth to you and what you are willing to pay, but not get your hopes up too much for success. Supply and demand in the real estate market are currently in a quite unfavorable balance for buyers. And the chance that among so many inquiries someone else is offering more (for whatever reasons) is relatively high - especially if you choose your own amount with reason.