Advice for finding suitable accommodations for a group in Nagoya during winter?

Hey everyone! I'm a bit nervous as it's my first time traveling to Japan, and I'm in charge of finding accommodations for our group of four visiting Nagoya this December. Since it's winter, I want to make sure we stay somewhere warm and cozy, especially as we plan to explore the city's winter illuminations and New Year celebrations. Do you have any recommendations for hotels or traditional ryokans that can accommodate four people comfortably? I'm also concerned about logistics and ensuring everyone's needs are met, so any tips on booking strategies or specific places that cater to groups would be greatly appreciated. Thanks in advance for your help!