I lived in Prague in the past, and stayed here when coming back with my family. As a former local, I can genuinely say that this location is amazing! Quiet street in the heart of Mala Strana, just around the corner from the Charles Bridge. Super easy walk to the castle, old town, and really anywhere a tourist would be interested to see. Super easy access to the trams and one tram stop away (also walkable distance) to the metro (green line).
The flat itself was very comfortable and clean. Magdalena and Tomas do a great job of providing all of the information you need to know for getting in, house policies, wifi etc. They also made sure I had arrived ok and were incredibly quick to reply to any messages I sent. This worked out perfectly for our family because they offer two flats on the same floor so we were able to all enjoy wonderful amenities in the same building! Highly recommend!!