First of all, Prague is great. And staying in such a nice apartment as the "Butterfly Appartment" made it even nicer.
The place is just great - exactly as described, very clean, extremly well equipped, well located.
Travelling with two toddlers for almost 8 hours it was very easy to arrange with Radka about the arrival - she waited for us, showed us around and checked if everything's ok in a few days.
Since we came by car, a safe parking just infront of the house is very practical. And a children playground at the spot is a bonus ;). Metro and tram are both ca 10-15 minutes away and you can get to the city centre in about half an hour. Kids just loved it ;). Also, Radka left all sorts of maps on the appartment and printed maps with basic locations in the near for takeaway with.
Also, what I just have to compliment Radka, is the kitchen. You don't usually bring all the neccesary stuff with you, so we were very greatful for coffee and some basic spices, oil and sugar.
I strongly reccomend renting the "Butterfly appartmen" - it's full of small and well-thought details and Radka is very easy to communicate with.
We're only sorry we could't stay there longer since Prague is such a nice city...