I visited Prag with 3 of my friends and the contact with Josef beforehand was very helpful. He provided an easy checkin and greeted us in the apartment he had just heated up for us, which had all the necessary essential one needs (sheets, towels and everything we needed to cook for ourselves).
The neighbourhood is very quiet and after a 10 minute walk to the station and a roughly 20 minute trip with the tram, we were right in the center of Prag inner city. I can definitely recommend Josef's apartment to everyone looking for lodging in the area of Prag!