Jan, Thank you very much for your help again!!
My first day to Jan's house was midnight due to the airline problem and Jan was willing to help and fully understanding.
Jan is nice to me and prepared all the need, his location is good, only few minutes walk to reach tram station, metro station, also to Wenceslas square and the National Museum.
He provide free coffee and tea, also the city map and many travel information as well
Just one small problem was his neighborhood quite loud in the early morning (5am ~ 6am)