Very centrally located - the sights of Prague 1 is right on your doorstep. Lovely modern and clean flat and was perfect for me and my friend as the flat layout allowed us to each have our own bedroom and bathroom.
Quick responses to questions and we were well looked after.
Be aware that as the flat is really central the streets are busy late into the night and if you want to sleep with the windows open/you are a light sleeper the noise may bother you.
A great place though and highly recommended.