Hi, Vasiliki!
I've actually stayed at Disney's Grand Floridian Resort & Spa as well as Disney's Polynesian Resort and I LOVE them both to pieces! We really love the Polynesian and every time we visit Walt Disney World, we get off the monorail and go for a walk around the Resort, sometimes we'll go sit in a hammock on the beach for a bit and watch the water taxis go by. Often times, we'll make a dining reservation at Kona Cafe or 'Ohana and spend a little more time there.
The Grand Floridian is simply magnificent with the Victorian charm and elegance all throughout the entire property. The lobby is breathtaking and there are fantastic restaurants and shops there as well. The rooms are so beautifully decorated and comfortable. There is also a new
"Alice in Wonderland"-themed kids water play area, and your kiddos are the perfect age to enjoy it, even in November! The temperatures are normally between a low of 59 and 79 degrees fahrenheit. I absolutely love it and I'm going to recommend keeping your reservation at the Grand Floridian Resort & Spa since you've stayed at the Polynesian before. I think it's so much fun to try out different Resorts, and those two happen to both be completely amazing!
I hope that helps with your decision, I'm not certain that it will though! Please feel free to ask more questions if you're looking for more specifics or if we can help with any other questions you think of.
Have a Pixie Dusted vacation!
~Jackie