This flat has some very big advantages. It is close to the center and well connected to trams and busses, just across the road there is a small supemarket, and there are good restaurants nearby. At the same time it has a convenient inside garage under the house which is very rare for the center of Prague. There is a full time receptionist who handed us our keys so check in is really easy. They also open the garage for you.
The flat is facing on a inner yard and is very quiet.
I slept on the sofa with my 9 year old son, and it was a not so confortable, I would not recommend for 4 adults.
We found the kitchen was not very well equipped but its enough to make simple meals.
The rental company is super responsive. We lost our keys and had to ring them for a spare late at night, and they were there in 45 minutes with a spare. Thank you!!