My family of nine traveled up to NY for a funeral, and we needed a place we could feel comfortable together. Sydney's place was really nice for us. She was very responsive and helpful and made us feel comfortable considering the sad circumstances. The home is beautifully kept and cozy.
The only things I'd say to keep in mind are that the walls are very thin, so you may be able to wear walking or the TV downstairs. If you have rowdy folks in your group and you care about being a good neighbor, you'll have to sush them constantly. Also, it's tricky to get the temperature right in the winter. Sydney warned us about that. Last, 11 people may be a pretty tight fit, as we started bursting at the seams with 9 (we used cot Sydney provided).
Overall, though, I'm really glad we found Sydney's place. We loved coming home to it after the funeral and after long (cooold) jaunts around the city. We're so thankful for her hospitality.