Sorry for being a little late to this post!
Overall I love having a bun room and they love it too! Pros are knowing they are happy and chill in a larger space, I found that once I was able to give them a room they became very content in their space and don’t feel the need to excercise around the house so much… So its great for peace of mind that you have content bunnies!
Cons are that I see them a bit less, despite them having open access to most of the house they just aren’t fussed about being anywhere other than their room lol… So i do have to make more effort to actively spend time with them… That said they do explore daily and come to say hi, they also spend a bit of time in the lounge most days. Glenn especially likes to seek me out, most days he’ll travel up 2 flights of stairs just to hang out with me in the home office and often will spend a couple hours a day relaxing with me there! So i guess it depends a little on their personality too and if they are already inclined to spend time with you I’d imagine they would continue to do so!
One thing that helped in an old house was setting up a bed and bowl of hay in the lounge (or in your case the kitchen or the additional place you’d like them to hang out) Glenn would spend a great deal of time in his lounge spot with – worth noting he was a single bun at that time and doesn’t do that as much now he has Nellie.
Overall I think the pros outweigh the cons and you will likely have content buns.