I've stayed with Jan and Jana before, so knew what to expect! Although they were away themselves when I was in Prague, the communication in advance was perfect, plenty of information about the city and the area (if you need it) available if you need it, and the arrival arrangements were straightforward and easy. Everything is done in a quick, efficient, but helpful, charming and friendly manner, which makes you feel very welcome.
The area (Žižkov) is mostly residential - it's quiet at night and feels very safe, with plenty of corner shops open late. Up the hill (10 mins) is the Metro, down the hill (10 mins) are the trams - take your pick, and you're in the centre in no time. Personally, I prefer staying out of town a bit because it's quieter and you feel much less like a tourist (although you obviously are one, you feel just a little bit more like a local, somehow).
The apartment is very well equipped - you have everything you need if, like me, you like to make your own food much of the time: it's one of the joys of Airbnb, for me, but it can be a frustration sometimes if the kitchen looks good, but when you get there you find there's just not enough equipment provided to cook with properly. But that's certainly not the case here: everything has been thought of - salt, pepper, a variety of spices, coffee, a selection of teas are all lined up in the cupboards. All the appliances are new and work well: the washing machine is very efficient and there's washing powder ready for you to use if you want to do some laundry. (Oh, and shower gel/shampoo is provided too if you've flown with hand-luggage only on the plane.)
It's a very warm and cosy apartment (I was there in November), the bed is very comfortable, good and firm, the bathroom is clean and fresh. The building itself is very peaceful, and the apartment looks out to the back, over the garden, so no street noise whatsoever at any time of day or night.
The wifi signal is very good and steady, and the wifi 'dongle' that you can take with you to access wifi all over the city is a great idea (can save you a fortune in sneaky fees your provider will hit you with when you get home...).
I can't think of anything to suggest to improve this apartment or the 'guest experience' - it's first rate/five stars already. Jan and Jana have thought it all through and manage to make life very comfortable and very easy for their visitors. As I said: I have stayed with them before (in another apartment in the same block): they would absolutely be my first thought next time I'm planning a visit to Prague.
It's a great place to stay, and the hosts are a fine example of Airbnb at its best.