Yup same size....I don't know if it gets bigger if you have more people, but we had 30 and there was still 1/4 left.
No limit to number of guest, but they will try to tell you they only have 14 chairs.....DON'T BELIEVE THEM! They will find more. I have a friend who was having 50, she had to get specail princing, but the did tell her after a fight there would be chairs for all of her guests. I fought them too and they "found" the chairs for my guests, there were even extras.