A few impressions --

As others have said the rooms are very very small. Even by London standards. Even by Tokyo standards. DO NOT consider staying in a standard room here with two people, or even one person with a bigger-than-could-fit-in-an-overhead-bin suitcase.

That said there is a lot else to like. The finishes are really excellent -- I keep thinking "this is like what I imagine one of those fancy non-chain boutique hotels that I am aware is so much nicer than the vast majority of chain hotels would be like, but no points so I would never do it." Like what you would get if Le Meridien married money.

In one particularly boutique hotel-esque touch, the bathroom takes up a full third of the not-big room footprint, making it spacious and elegant at the expense of more room space -- but not necessarily a bad tradeoff. Also very nice, Malin and Goetz-branded toiletries.

The pantries with snacks and coffee at the end of each floor, free to all guests, are a very nice touch.

Some of the staff seem to be a bit over the top, in a "parody of a boutique hotel" kind of way and verging on a "makes you feel like you're not cool enough to be welcome here" kind of way, which is not a great look IMO. Like early-era W.

Funny little things, though -- the TV is a bit small and of a low-end brand/style in comparison to everything else in the room. There are three "don't steal me" nubbin-type clothes hangars on a rack on the wall, but then regular hangars in the narrow hanging space in the closet. There is a wall outlet with two USB plugs above the desk, and plenty of regular outlets available but located awkwardly below the desk (perhaps this hotel's guests have only a tablet computer, or a new USB-powered MacBook)?