Really couldn't fault it! Staff were super welcoming & service-minded. Location was super ideal, especially travelling from Gatwick Airport so could just jump on the train and the hotel is only a few mins walk from the station.
Plenty of shops, cafes, pubs, bars, restaurants etc. around the hotel. Also really easy to walk to Buckingham Palace, Big Ben etc. We actually walked around London a lot this time, rather than using the tube/metro, as we had on previous visits.
The rooms are comfortable - some might think small, but it was actually bigger than I expected after reading reviews. Very cool with iPad controlling the room and smart use of space with storage & safe under the bed.
Also, wanted to give a special thanks to Miguel who helped out our friend. He accidentally booked the wrong Citizen M hotel in London but he and his manager (Can't remember his name unfortunately) really helped him and it was no problem to switch hotels, so he could stay in the same hotel as us. An extra special touch with the complimentary drinks voucher - was a very nice surprise! And made his bad day go to the best day!
It was my first time staying with Citizen M but it certainly won't be the last! I will definitely come back and recommend the hotel & location to friends & family.