Great apartment! Communication with Anna was fantastic. Anna gave some really good recommendations for everything that worth mentioning in the area - listen to her, she knows what she's saying! :) Best coffee place in 2 min walking, as well as sushi bistro. The location is very safe and it's perfect if you like to be in the very center of the tourists area (for me it was little too center). Even though it's in the center of the Old City, it's still quite and private.
She has really cool vinyl and sound system (but note it has no Bluetooth option, so you should bring a suitable aux cable).
P.s - if you have a late night flight, there is just around the corner a place that you can leave your luggage in a dissent price.
Prague is beautiful, enjoy every minute of it! :)