Set in a row of Georgian townhouses, let me say from the start, that they are getting it right. Great location (close to Hyde Park and Oxford St), beautiful decoration in the public areas, hearty welcome on reception and a really nice feel about the place. It has the wow appeal and you know it's going to be a great stay.
Rooms are really comfortable, with a real attention to detail. Bed linen is of a really high quality, the furniture of a high quality, TV in the bathroom, big fluffy towels (which were replaced during my stay), Sky HD, free wireless internet (that's worth £15 a night), free soft drinks in the mini-bar.
The market for hotels is competitive in London, finding a hotel where you're not just part of the crowd is becoming more difficult. The Arch have struck a really nice balance between attentiveness and anonymity. Rooms can be booked for around £229 a night including breakfast until April, breakfast is of a really high quality with plenty of choice. If your budget runs to this hotel, I'd highly recommend you give it a try.
I'd only have one thing to improve, that was the bar closed at mid-night. Having got back from a function, it's always nice to have a night cap, so you'll need to pop futher down Great Cumberland place for that.
Official Rating - Unknown.
My Rating 5p.