The location is just incredible. You can reach literally every corner of the Old Town in 15 minutes on foot. There's a big mall with a supermarket just around the corner. Trams and subway just the same. The flat was spotless and very spacious. Smoking is allowed on the balcony (a stunning view). I cannot think of anything missing. We plan to visit in spring and if the flat is free, we won't be looking for anything else.
When it comes to the host, there's nothing really to talk about - the contact was fast and polite. All the appointments were on time.
I can definitely recommend Romana's flat. It's a great place to stay and I can guarantee you'll love both the flat and the city of Prague :)