Our stay at Jon's place was very nice, the place was clean and mostly as we expected it to be.
The only things that bothered us were the fact that the apartment got really hot (but if you stay there at anytime, besides in the summer, you should be fine) and the fact that the windows were very old and therefore we couldn't open those to let in some cold air at night.
Jon himself was very nice to us, responded quickly and made sure we have everything we need during the stay.