Our experience with Petra was excellent.
She always replied our messages in a short time being friendly with us. Two weeks before our travel, she sends us a House Manual, where she explains all the facilities of the home and give us tips to reach the home and nice places to eat, supermarkets, how to buy a transport ticket... Also she gave us sweets and czech beers.
The apartment is very cosy, it has all the facilities that you can need in holidays, being very modern and clean. It has a lift. Despite that it's a bit far from the center of Praha, you can take two trams that leaves you in the center in 20 min.
The overall score is excellent and we recommend everybody to select the Petra's aparment.