We never met Mary and Dete, but they provided excellent instructions on checking in, directions, and suggestions in advance to our stay.
We arrived early, but reception was very helpful in keeping our bags until our check in time.
The place is located in a prime location - very close to all the attractions and the U-Bahn station that is very easy to navigate.
Just make sure to bring your own toiletries as the room did not have very much.