Clean and functional place within walking distance to the GG underground station, which means central London is accessible within 25 mins max. Staff are friendly but not very proactive. My room stank of tobacco smoke the night I arrived and the window was half-open with 5C temperature outside! My natural assumption which was later confirmed by a member of staff: some guests open the window and just smoke. The smoke alarm is either fooled or simply does not operate.
I could not close the window and neither could the reception staff until the third day of my stay, due to some hinge which only one member of staff seemed to know or had just discovered, it was successfully closed.
Bottom line I would recommend: implement strictly 'no smoking' policy in the rooms and have written instructions in the room about how to open/close windows.