I stayed for 3 nights. Communication before my arrival was very good and they sent me detailed information to find the place. Check-in was very straightforward and easy.
I only needed the room for sleeping so I was leaving at 7am and returning at around 9pm. I never saw the hosts after check-in and they were very discreet in the evenings.
The room is small but there is a cupboard, armchair, table and bed so that was enough for my purposes. The bed is comfortable and the sheets were very good quality (John Lewis). There is a kettle in the room and the host had left tea, coffee and biscuits, which was a nice touch.
The bathroom is shared with the owners. It had what you expect: shower with good flow, toilet and sink.
The only thing to be aware is that the room is on the first floor and the windows are not double glazed. It is a quiet street but if you are a light sleeper like me, I would recommend earplugs. The other thing is that there are animals in the flat. They did not bother me but the smell in the corridor is a bit affected by that. However, this did not affect the air in the room (and you can open the windows if you want).
I will definitely consider coming again for my next business trip as it is a very short walk to Moorgate.