Everything was great! We highly recommend staying with Alex and Kate. The studio itself was clean and had everything we needed, including a bottle of champagne :) The location is perfect - just minutes from the heart of old town and everything was perfectly walkable! Plenty of great spots to eat nearby and you're close to all the sites.
We had to pick up the keys to check in at Alex and Kate's office, which was located a 15-20 min walk away. Upon arrival, we were provided with a helpful map including restaurants and all the information we needed for our stay. Check out was super easy and just involved dropping off the keys in the mailbox - easy! We especially appreciated being able to drop off our luggage after checkout at Alex and Kate's office - that was super helpful for us on our last day of sightseeing.
We would definitely stay in one of Alex and Kate's appartements again on our next trip to Prague!