The location is amazing, it could not be better. You're two minutes from Old Town Square, it's really great. There was a tiny bit of street noise from late night partiers but not much and it didn't keep us awake.
The apartment was clean and the bed was very comfortable. The check-in process was good and the entrances into the courtyard, then into the apartment entryway, then into the apartment ensured plenty of privacy and safety. The kitchen is great, the sitting area is nice, and generally the apartment is good.
Our only minor complaints were the antiquated and glitchy aspects of the old touch screen tablet-controlled lighting and some small issues with the flooring coming up in spots. The bathroom is good, but the shower door allows a good bit of water onto the floor.
All that said, we slept well and were comfortable in an incredible location in Old Town Prague. We were very happy with the apartment and with a few simple improvements, this would be an absolutely perfect place! Regardless, it is still highly recommended.