Help with layout of living/family room

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Hi

My wife, two young kids (4 and 2) and I are going to be moving into a center hall colonial house that doesn't have separate family and formal living rooms - just one decent sized room (26'*15') for both with a small space (14'*10') off to the side. I've attached a floor plan of the space as a reference. Since I think the room will be used as a "family room" 80% of the time, I'd like to furnish it less formally. We're also moving from a small apartment so we're basically starting with a clean slate with respect to furniture. The room will have two large entry points - one at the top left which leads to the kitchen and one on the bottom left which leads to the hallway/front door.

I'd like a little help on furniture layout to see if I am thinking about things the right way or if I am missing anything.

My initial thought is to:
* Concentrate furniture in the center (vertically in the image) of the room so that nothing blocks the flow of the house
* Have a large comfy leather sofa against the wall facing the fireplace (which will have the TV mounted above)
* Have a matching love seat on the left side of the sofa (nearer to the kitchen)
* Have two matching armchairs on the right side of the sofa (nearer to the hallway/front door)
* Have a large coffee table in the middle of the U formed by the loveseat / sofa / armchairs
* Have two (slightly more formal) chairs and a coffee table in the smaller room off to the right
* Have some kind of storage unit (sideboard etc.) in the room - probably in the top right corner of the image

Some specific questions that I have
1. Is there a better layout that I'm not thinking about?
2. Is seating for 7 (sofa = 3; loveseat = 2; 2 armchairs = 2) appropriate for this size room? Too much? Too little? Should I be considering a different combination of seating e.g., sofa and 4 chairs? As mentioned, 80% of the time it will just be the 4 of us
3. Should all the leather furniture in the room match (i.e., be the same style/color)? Will it look weird to mix/match? (I assume the answer to this is yes?) We're looking at H&M sofa/chair options but not every sofa appears to have matching pieces.
4. Are there any suggestions for H&M style options that can do double duty in a family/living room? Should I be avoiding any particular styles because the room will need to function as a "living room" some small % of the time?

Thanks in advance for any advice / critiques!