Location is superb. Right on the shopping street Stroget so you can basically close to everywhere and everything. Tivoli is just a short 10 mins walk away.
But with the central location comes the issue of noise. Apart from the usual street noise, there is a bar close to the apartment that plays music loud into the night on weekend nights. We were there on a Friday, and had to open the windows for ventilation. Music from the bar lasted till 5am, then their guests hung outside till 7am. Will most likely not be an issue if you are staying there over the weekday nights. The location does make it seem like a good compromise if you are a heavy sleeper.
Apartment is very clean, but it does look a little more worn than the photos.
Communication is great, we requested for early check in and they were able to accomodate. Responsive to text messages.