Jan's apartment was great! It was just what I thought it would be, and probably surprised me for the better once I saw it in person. It's very clean, WELL equipped, and located a short walk from Leidesplein square which is my personal favorite part of town. As I am familiar enough with Amsterdam, I did not communicate much with Jan during my stay, but I was given the impression that he would have gladly helped me out with anything and everything, had I only asked.
I would gladly return to Jan's apartment in the future and I recommend it to all.