First off, this is a very nice apartment. It is clean, spacious, and modern. All things combined (the apartment, the location, and the host), this may be the best place I've ever stayed at. It was 3 of us traveling and we had a comfortable stay. Two of us had a bed each and one took the large sofa bed. In addition, the place has all the amenities you need: dish washer, laundry/dryer, all the cooking utensils.
Sarah was great at responding to all my messages. She arranged a ride to and from the airport for a great price. I highly recommend this apartment to anyone visiting Prague!

(The only downside: there's a construction within the building as well as one across the street. It starts early every morning even on weekends and it can be pretty loud. It is obviously not the host's fault and there's nothing they can do about this. So I advise you to bring ear buds!) This is only a minor issue for all the positives this apartment provides.