It went all very good. Even though the check in was at 3pm, we were allowed to leave our luggage with them earlier to explore the city. The room is just a minute away from the Victoria line (which is even in service at night). Everything was clean, nicely made up. Even towels were given!
Just the door is tricky, so it was hard to open it as it wasn't clear how the knob works. So don't panic if you can't open it on the first try :)