First off, Jan went above and beyond what we expected from a host. And you should book this place definitely for the location and the hospitality.
The location was amazing. Literally right next to Charles bridge on the mala strana side. It was such a privilege to wake up with the view of the bridge and Prague Castle in the early hours and not have it be full of tourists. Definitely went out early onto the bridge to get some great pics! Also, there are some markets over the weekend in the area next to the building, which was super quaint and convenient for food.
Jan was out of the country and arranged for his father to come pick us from the airport. His father was super helpful and was able to help us carry our luggage up the stairs (which I'll admit was a lot!). He also gave us the keys and gave us a quick tour of the apartment (explained how to lock the doors, how to cover up the windows, how to use the a/c, etc).
We had some issues with using the induction cooktop and the tub shower head, but Jan was quick with his responses and was able to help us.
Also, the apartment was very clean. For reference, my clean freak mother who normally has a problem with this stuff did not complain at all. There's also a washer/dryer in one of the bathrooms and laundry soap which was convenient. Toiletries in the bathroom of you left something. There was coffee, tea, milk, drinks, and other food/drinks in the kitchen. He also provides umbrellas and house slippers.
Jan also invited us for lunch on one of our days off at a nearby restaurant and it was like talking to an old friend. He was also nice enough to drop us off at the train station one morning. We will definitely be boing Jan's place again when we visit Prague again!