The location of this apartment can't be topped, you have everything important around you. A supermarket, small shops or just the city itself including all of the most famous sightseeing stuff is around you, so thats a big point for this apartment.
In the apartment, there is nothing you could miss, its all clean and in a good condition.
Concerning Lukas one just can say he is a great and openminded host, if there is anything you want to know, he answers so fast.
Altogether it was a good stay and i can only recommend you this riverside apartment!