Work brought me to Prague today. I found a nice place to stay, in a lively area of Prague, just outside the old city, in Havelská (street).
This is the street where Mnisowsky used to live. His house is just one block away, and I believe it is this one.
Just round the corner is the house where Marci lived. His bust was attached to the building on the instigation of the historian Josef Smolka: