This Sofitel is a real gem!
We stayed there this summer in what I believe was a luxury room... clean, well-appointed, comfortable. Service (both Front Desk and Room Service) was professional without being pretentious... some very nice, warm people working there.
AdLib was *okay* in our opinion -- not bad, but we thought that there were better options within walking distance.
Sacramento, for example, is a quick cab ride (or about a 10-15 minute walk) from Sofitel Liberdade and was a wonderful place to have dinner.
Think you're going to have a wonderful time!