Do all 10 chairs need to be at table all the time or can it be 8 chairs and 2 you bring over from somewhere else for large sit downs? DIAL UP YOUR CHAIR sizes to be proportional to table so, as to not look like child size chairs. Restoration Hardware furniture is over sized and generous proportions compared to many other retail sellers. Just any chair could be easily dwarfed by the RH table and look tiny. Here are a couple of my favorite modern chair makers KNOLL Brno flat bar chair which can be bought at auction and recovered in leather or vinyl of your choice and David Edward Furniture made for corporate, resort and colleges and available through dealers, I am showing here as a "host chair". Other "host" chair items possible of course. I just like this one.

Not sure if you can make you current table height adjustable and what's involved with making the banquette wide enough for lounging but here are some pictures. Places that fit out caravans etc might be able to help with the mechanism for the table and don't forget that stools can double as seating and tables too for added functionality as per this recent Houzz article..[Ultimate secret decorating weapon[(https://www.houzz.com.au/magazine/is-this-the-ultimate-secret-decorating-weapon-stsetivw-vs~55543429).

Lovely sofa - traditional with a modern edge. Will look gorgeous. I think you need to balance traditional with modern but don't be afraid to incorporate the odd special antique piece which will give your rooms a nice ecclectic feel and make them look as though you have collected things over time rather than rushed out & bought them all at once. For example, most entertainment units are pretty uninspiring however if you could find a gorgeous antique cabinet & convert the doors to slide inwards you could end up with a lovely unit that disguises the TV when doors are closed which will also make your small room appear larger. As your rooms are small, if it was me I would keep it simple with clean lines as you have done with your sofa and also soft in tonings. Try to minimise the heaviness in your pieces through legs on cabinets etc. so that they float above the floor. Some ideas in pics below & some shops to visit. Don't rush - take your time & do one room at a time & it will come together beautifully. Choose big pieces first. Good luck!

something like this might suit by moving not enlarging the door between kitchen and living allows for better use of wall space with a tall pantry and base cabinet with wall shelves continuing over the couch space, continuing base cabinets along the north wall with a a modest island and extending dining table with extra folding chairs stored in the pantry