Alex and Kate are great hosts. The apartment is spacious and comfortable and has everything you need for a city trip or a longer stay. It's located close to the main train station which was one of the reasons we booked it. The main shopping streets are within a few minute's walk and it's within a 10-minute walk to the old town square.
We booked it for 3 adults, 1 man and 2 women and we felt safe and comfortable going around there.
Pro Tip when you go to Prague get the public transport day pass so you can use the extensive tram network. Prague old town is a very walkable city but its super easy to take the tram, just use maps to get around.