K.H.
I was just at Harmony Tea Room in Westwood and it was great. I took my four neices ages 8-12 and they all had a wonderful time. I think they would do a great job. We were in the main room but they also have a seperate "Enchanted Garden" room where they host parties and they have "princess" tea parties with dress up included. I can tell you the food was amazing, the service was great and I would definitely bring my neices there again as well as go with my own friends. I hope this was helpful. There website is http://www.harmonytearoom.com/index.html
I think your 6 year old would really enjoy it.