10 months later, I stayed once more at this hotel, and experienced the high standard of accommodation. It's a treat to stay in an environment where every corner of the place has attention to design -- well, it is one of the Design Hotels!
It's quirky, no doubt too arty for the more conservative traveller. However, the beds and linen are incredibly comfortable , service levels very attentive yet not stuffy or cold, and in particular cleanliness is exceptional - perhaps too clean at times as I stayed for quite a few days and felt they were too quick to change sheets!
The staff are so friendly and considerate , when I woke up hoarse from being at a very smoky Athens bar one night, they made me a camomile with orange peel and honey pot of tea... as a home away from home, you can't do better than that!
A couple of points - it is situated on a busy street so if you are a light sleeper you should request not to have a room facing the main road at the front. I tried the spa - if you are after a very therapeutic massage this may be too much on the "relaxing" rather than "remedial" side. I wouldn't be going for it again, but I think it may be in keeping with the French, as opposed to Swedish, tradition of massage.
There was one glitch, when very low level cigarette smell started to emerge after the aircon had been off for some time, eg while I was out. This was on non-smoking floor. I liaised with staff, and it was investigated thoroughly - probably some previous guest had illegally smoked. I was encouraged to keep air-conditioning on at all times, and offered another room, while I declined, because the latter did the trick.