I really can recommend Astor Hyde Park Hostel, it is a beautiful Victorian House accomodated as hostel with a cozy lunch, clean kitchen and really good organized staff. Everybody was very helpful, especially Siissi, the always busy manager, Rapha and Momo the night portier, Leo, Clari and Rob, the spotless cleaning staff and Ciara, the helpful receptionist.
The piano in the lunch is very special, and one is just infront of the Royal Albert Hall and the big Hyde Park. It is really a first class location. Our room had a private bathroom.
I definitely will come back...Thank you a lot!