The apartment was lovely. It was clean and very cosy. The beds were extremely comfy and there were extra pillows. The kitchen was well equipped with cooking utensils and coffee and tea. The apartment is close to public transport (perhaps a 5 minute walk or less). It got slightly hot at some points, but the neighbourhood was quiet so that we were able to leave the windows open.
Zdenek was an excellent host. We had some trouble entering the apartment initially (completely my fault - I wasn't being proficient with the key) and Zdenek was completely accommodating when we phoned him up at 11.30pm for help.
And Prague is a beautiful city.
Thank you, Zdenek!