With 15 years commitment in the same structure, it is 1.92% - now I'm unsure whether one should rather do that?
The example with the 1.8 over 15 years without equity has been confirmed to me by several people that it won't work, because you always need something like a private loan in addition. It's through Sparda and they often initially look like that and afterwards it always says that it doesn't work without equity, which is also logical.