We didn't meet Jan, but his girlfriend Hanna was extremely kind and communicative.
She was expecting us in the apartment with cold beer and ice cream in the fridge, can't beat that.

The apartment is very nice, clean and lovely. It's a few blocks away from Belvedere palace so if you like to walk cities like we do, it's perfect.

They were also very flexible with letting us leave our baggage in their basement the day we left until we took our night train. Definitively recommend this host.