One word : PERFECT!
Praha is such a beautiful place but when you also have the chance to stay in a great flat (so clean, light, decorated with taste and of course very comfortable), ideally situated in the city (everything is near by foot, did not take the transport during our stay except from and to the airport! And the street is charming and dynamic) and, last but not least, a very thoughtful, happy to help and very (very) receptive host, all I can say is : it was perfect from the start until the end. Thank you again so much Dagmar & Oksana !