The apartment is well located walking distance from Old Town, the Charles Bridge, the Jewish quarters, etc. (15 minute walk) and very close by to a nice shopping center with a supermarket and the B subway line (two blocks way). One of the doormen, Jan, is simply amazing! He speaks English very well, he has a wonderful personality, always engaging and willing to talk. He is a great resource for anything you need.
As far as the apartment, it is located in a very modern building and the apartment itself is very modern and clean. It is perfect for two adults to be comfortable, perhaps three if one is willing to sleep on the couch which would turn the main room as a bedroom. The main bathroom has a bathtub only and no shower or curtains so you cannot take a shower or the water is sprayed throughout the bathroom if you use the hand-held device. The other has a toilet and a small sink.
The pictures, which are mostly of the only room from various angles, make it appear bigger than it really is. If you plan on cooking, there are just a few basic kitchen supplies. We only made coffee in the morning in the provided coffee pot but got all our meals outside so that was not an issue for us.
I would definitely stay here next time if I came with just my wife. For a party of three or more, I would stay somewhere else. What made this apartment great was the location and Jan the doorman. Seriously! He could be your tour guide! If you stay here, please tell him Sergio and Leonora say hi!