We loved our stay at Sarah & Jan's place.
Sarah was lovely and easy to deal with (I did not meet Jan). She was super helpful from the moment we booked, sending guides and information for our trip. Throughout our stay she was always helpful whenever we had questions or needed help booking a taxi, train tickets etc.
The apartment is in a great location. Close to the tram on the main Rd, the river, centre of old town and the metro station. Public transport in Prague is simple and it makes it really easy to get out and about to sight see. The apartment is bright, clean and has everything you need. If you like to watch TV I recommend bringing your Netflix login details. Also if you are using the car spot just know there is a small fee (the listing has this at the very very bottom so you might miss it).
We absolutely loved staying here and highly recommend staying with Sarah & Jan!