This is a great apartment for anyone planning to visit the historical areas of Prague. It's a perfect location for people willing to walk--you can be in Old Town Square in five minutes, the metronome statue in ten, or across the Charles Bridge in 15.
The apartment itself is satisfactory--Misha keeps it very clean. For those of you looking for a more "cozy" or "lived-in" apartment, there may be better options. Though the decor and amenities provided are sufficient, they feel somewhat impersonal and generic; the lack of many creature comforts (e.g. proper lamps, blankets, etc.) make it clear nobody lives here full-time. Still, it suited our needs nicely.
Misha is very responsive, and was flexible with our arrival/check-in and check-out times.
If you do plan to stay here, make sure you've got everything you need before you step out the door--the four flights of stairs between the street and the apartment can be a pain!