The apartment is very conveniently located and was only a couple of subway stations from the old town where the main sites are. We really liked that it was located just beside the elevator of the subway station, since my grandma had some difficulty with steps.
You may wish to note though that while the elevator in the building led to the 5th floor, one would still need to climb a short flight of steps to reach the apartment itself. For us it wasn't really a problem since it was quite short.
The apartment itself was clean and looks just as the pictures. The kitchen was well-equiped.
What we liked most was the exceptional service provided. We got help with booking taxis and reserving tours. It was all very fuss free. Kudos in particular to Irina, one of the staff on the ground floor. :)