On the plus side, the flat is large and central, very well located in Shoreditch and close to public transit (many buses, underground and overground). Sal was very helpful, explaining everything and answering every question I had.
Additionally, there's no real shower with a heater, but a little heating device plugged on a normal pipe. As a result you can either have a cold shower with pressure or a scaldingly hot shower with no pressure. I didn't manage to find a middle ground.