Ok if you just need a place to sleep. It is located really close to Prague Castle and the old town, so definitely great if you're just visiting Prague for a weekend and want to see as much as possible. The owner is friendly and communicative.
However, the room was very cold, the heater very small and not working properly (I was staying there in January, it was below zero outside). The room was very dark and you can hear lots of noise, both from the other rooms and from the street. The kitchen does not have much equipment.
The owner's mother who came to clean kept knocking on my door since 10 am, even though the official checkout time is 11 am...