We had a great time at this apartment. It is very centrally located, about 10 minutes walk from Charles Bridge and perhaps twenty minutes from the Castle.
The apartment is in an old style block but is very modern inside and was absolutely spotless. It is at the top of several flights of stairs so expect a slightly elevated heart rate if you are arriving with lots of luggage but that is the charm of an older building.
It is very close to Charles Bridge and about 20 minutes from the Castle.
Opposite the apartment block there is a modern building - to the right of the School as you look at it that has a fantastic Italian restaurant L'Osteria (red sign) inside. Delicious pasta and would def recommend.
If you come out of the apartment and turn right you come to the main street with the National Theatre on it. Cross this street and on the opposite side there is an amazing ice cream shop - Creme de la Creme and next to this the Black Light Theatre which has some interesting shows. In the same block as the theatre there is also a delicious Vietmese restaurant. Further along there is a large Tesco supermarket which is convenient for supplies.
If you turn left on the main street you will come to the National Theatre and opposite this is a traditional Czech cafe / resturant called Cafe Slavia - it is very easy to soak up the atmosphere and nostalgia watching the trams go past.
Overall we had a great time - Michael is a great host and would also recommend taking him up on his offer of arranging a taxi from the airport which worked for us as a family of five with a pram.