I had brunch earlier this year at Atwood Cafe. I liked it a lot! The food (mascarpone stuffed brioche french toast) was excellent. The service was friendly, professional, and efficient, like you would expect in a nice hotel.
I haven't had brunch at Cafe des Architectes, but I've eaten dinner there twice this year and loved it both times. In fact, I've loved everything that Chef Noguier has been involved in, and I can only imagine that his brunch at CDA is excellent too. Last year, when he was still at one sixtyblue, I had their brunch on Mother's Day - at the time it was the only day of the year they served brunch - and it was absolutely spectacular.
HTH