I love the 4S and have stayed at various properties in North America and Europe. Two items about the DC property that might improve the guest experience:
1. Please don't allow smoking in the courtyard where people are eating and enjoying the outdoors. I had my daughter with me and the smoke really bothers her. Plus, smoking is passe, and some of the cushions have burn marks in them.
2. At check-in, please don't offer to 'upgrade' a guest's room for an additional charge. We know what we want and would like to spend. Or offer an upgrade as a courtesy for longstanding patronage.
Otherwise, terrific staff. Mel was very nice to my daughter, and the little takeaway food for the trip home was a perfect finishing touch. Thank you!