I'm looking for an apartment near Göppingen and have checked one out today. It's really good, the price is okay at least for the current market, the kitchen is included for free etc. etc.

But the one thing I'm really afraid of is that there are no radiators there but instead there's a "Gas Ofen" in the hall that is connected with vents to the living room and the bedroom. All I saw inside was a pipe and a valve which left me even more confused. The old tenant mentioned it's fine and that it doesn't get cold in the winter (he was the one giving me the apartment tour). I'm kinda really suspicious of it because not only it looks like it was hidden on purpose on the listing pictures, but also when I sent a message to the landlord asking to explain how it works, he said he would do it when we already agree on everything and are going to sign the contract. The thing is, I've been looking for an apartment since July and I've only gotten 2 or 3 visits since then. I guess I'm getting a bit desperate

It also has a boiler for hot water in the bathroom but that's nothing new.

But I'm still confused as I've never seen anything like this. What do you guys think? Should I be wary of it or should I just bite the bullet and accept it?

Edit: pic of the oven from the living room