Viktor's apartment is lovely and in a fantastic location. It's just seconds away from the Dancing House and the river, and around a 15 minute walk from the old town, given you plenty of opportunity to see the sights on your way into town.
Viktor and Stefan were extremely helpful, answering all of my questions pre-arrival and accommodating us with an earlier check in than usual due to our early arrival. There are also very helpful guide books that Viktor and Stefan have put together to guide you around the apartment and the city.
Would definitely recommend to anybody visiting Prague!