Martina is an excellent host - she is very friendly and helpful. Her studio apartment is very clean, modern, spacious, neat and has all the amenities you need (even a fully equipped kitchenette). I would recommend her studio apartment instead of a hotel suite! Her location is wonderful with all types of food within walking vicinity. The tram and subway is also close by and all attractions easily accessible by foot. Her neighbourhood is very safe even when I walk back along past 10pm. It is easy to locate her apartment when you first arrive - once you reach the Main Railway Station, walk into the attached subway (note: there seems no lift for heavy luggage so you have to climb the stairs with luggage manually), alight at Florenc station (1 stop) then walk just 5 min in a simple ("inverted L shaped") direction to reach her street. Her unit is at the top of the street so it is very easy to locate. It is much easier to reach her apartment by subway instead of taking a taxi as the distance is too short/you can avoid being cheated by a taximan.
I will definitely stay at Martina's if I come again to Prague.