Landlord called our home shocking. We’re both falling apart over it

My partner and I live in a one-bedroom apartment. I’m a student working part-time, he’s self-employed. Keeping the place tidy has always been hard for me honestly, my whole life. It gets cluttered but we keep it clean, no trash or anything like that.

Landlord came by for repairs last week, we weren’t worried. Then we got an email saying they were shocked by the state of the place, called it messy and dirty and said they can’t have tenants who don’t take care of their home. 10 days to clean up and arrange a viewing.

It hit hard. My partner is already overwhelmed with self-employment taxes (we’re in Germany) and just broke down yesterday. I feel like the landlord overreacted honestly, if someone lives somewhere it’s going to look lived in. But my partner feels like we failed them and should have been more on top of it. He seems really lost and I don’t know how to help him or myself right now.​​​​​​​​​​​​​​​​