I stayed here for 4 nights and were very content with our visit. We spent most of our time outside, but the apartment had everything we needed otherwise. It is a small area, but it's still well kept and provided a nice place to relax in between long spurts of exploring Prague.
The apartment felt a little stuffy/hot at times, but cracking the windows open helped a lot. Other than that, the biggest positive in my opinion was the apartment's location. It's a 10 minute walk from new town and is surrounded by plenty of great bars/restaurants. I'd recommend staying here for anyone looking to explore the city.