Heike's apartment is very well situated - close to the tube station and in an area with lots of restaurants and with good atmosphere. At the same time the apartment is really quiet, with no disturbing noices from the street.
The place was flawlessly cleaned when we arrived and has all the things you need - a very comfortable double bed, a well equipped kitchen (with great coffee machine), and a fabulous bathroom (the Japanese bath tub is amazing.)
I and my family stayed for a month for work and we didn't miss anything for a smooth stay (Heike even helped finding a nursing table for our baby daughter).
Communication was easy and clear with Heike, and check in and check out was arranged exactly to our wishes.
I can warmly recommend Heike's apartment, also for longer stays (when it's particularly important that all conviencies are in place, like washing machine etc).