My friends and I booked two rooms for four nights at the seven senses and were given the Bangkok deluxe room and the Chiang Mai jacuzzi suite. We had taken the over night train from Bangkok so arrived too early to check in but they were happy for us to leave our bags and gave us a map and a bit of an intro to the city. First impressions were excellent- it's a very pretty boutique style b&b, tastefully decorated and the staff we met were friendly and knowledgable.
We headed into town to explore and discovered that it was a bit of a trek to most of the areas that you would want to visit. Although Seven Senses is right on the edge of the old town, most of the popular temples, bars, restaurants and markets are either in the heart of or over the other side of the old town, hence you're looking at a 30-60 minute walk or a 120-150 Baht tuk tuk ride to get anywhere. Incidentally pretty much all the taxis ("red cars") and of course the tuk tuks are open sided which is quite fun at first but the volume of traffic on some of the roads and the pollution it produces can make it quite an unpleasant experience.
Anyway, returning to the hotel to check in, we found the rooms were really nice- each with its own character. Bangkok had a big bed, sofa area and spacious bathroom with rain shower. There's a well stocked mini bar and TV with some English channels. Chiang Mai didn't have the sofa area but was still spacious although the bathroom only had the jacuzzi bath with a shower attachment (and no curtain).
Over the course of our stay we discovered a couple of small problems- the air con in my room seemed to stop working, and there was a rather loud cockerel that was crowing from about 5am fairly close to my room, both of which slightly impeded the perfect nights sleep.
Staff were very friendly and eager and mostly spoke good English. Overall we liked the hotel but the location means it won't necessarily be for everyone.