The apartment is just as the photos show - a very large studio with a nice bathroom and the perfect location between the Charles Bridge and the Prague Castle. Across the street is a great wine bar and some good cafes and restaurants. It was a great spot for exploring the city as we walked everywhere during our stay. The apartment has a well-stocked kitchen and is very comfortable. The exposed beams give a very cozy feeling as well.
Lenka was helpful to arrange transportation from the airport upon arrival, and the key was at the cafe in the building's courtyard as planned. Our driver was overly eager to help and added some confusion to the process, but it was resolved once he allowed us to read the instructions and handle the keys ourselves.
That said, we had two issues while staying there that hopefully the host can resolve for future guests. The apartment was listed as having a washing machine, but it was not available upon arrival. Lenka said it should be delivered in the next week or so, so it may be worth checking before booking. The host did offer to help with our laundry, but we chose to do it at a nearby hostel instead for a fee.
Also, because of the building's proximity to a cafe and bar, there are many smokers situated near the entrance each night. As the apartment is on the top floor of the building, the cigarette smoke rises in from the hallway under the door. Lenka says we are the first ones to mention it, but it was hard to ignore. Hopefully there could be some modifications to prevent this in the future, considering that the apartment is listed as non-smoking.