First, Dieter is a very nice man and an excellent host--attentive to needs and not overbearing.
His London flat was beautiful--clean, sparse, tastefully decorated and very well organized. Everything one could need on vacation was available as in one's own home, and everything had a little nook or cranny it belonged in. The wifi was fast and a bluetooth speaker provided great sound for the apartment. Minimal yet also entirely functional and comfortable. It was beautiful with great natural lighting and views of the many scenic gardens in this neighborhood.
Very conveniently located within minutes walk of both Russel Square Station (Piccadilly line straight to Heathrow--a great and easy way to and from the airport!) and Kings Cross/St Pancras, which will get you anywhere. The neighborhood was adorable with many historic pubs and shops, including groceries. Also just a short walk from the British Library and many (free admission) museums.
An excellent value! Perfect for two people. Highly recommended--book ASAP!