Never got to meet Ruben or Diana, but after picking up the keys at the local shop, their friendly roommate showed us in and ensured everything was satisfactory.
The flat is cosy, situated at the top floor of a nice building in a relatively quiet area close to Mare Street and Hackney Central station. Sharing the kitchen and bathroom with the flatmate worked out seamlessly. As we were 3 persons only one slept in the living room
I would definitely consider renting the apartment if was ever in the Hackney area again.