This is a very nice apartment, in an excellent position, close to the National Theater, to the river and a short walk to the Old Town Square, to Charles Bridge or to Kampa and Mala Strana. It is on a very quiet street, although it is only 50 meters to the busy Národní Třida, where you can find supermarkets and plenty of stores, and where you can catch many tramway lines (including those going up to the Castle).
The apartment is well furnished and clean. It has big windows and is well-lit, even in winter. It has a large bedroom, a TV with Netflix etc. and a desk where one can work or just use one's laptop (excellent WiFi). There is a really good kitchen with a big fridge, electric kettle, coffee machine, toaster, pans and pots, so that one can comfortably cook at home, although Prague is certainly not expensive when it comes to eat out. There is a washing machine with dryer function.
Magnus would react immediately to every quest and is a very attentive host.
I really loved my stay there.