Great place on top floor in a calm area close to several parks. Also close to supermarket, Sinobo Stadium (if you're in town for football) and two of the best craft beer pubs in Prague. :)
If you arrive by car there is a safe garage in which you can park for free.
A bit from city centre (at least if it's a hot day) but there are several trams just a two minute walk away that will bring you to the center within 15 minutes.
Sarka is a good host and responds quickly.