Here are design rules offered by Starcraft Builders. I'd heed such rules or alternatively I'd mock up something in my existing place to replicate what you're intending to do and see how functional it will be. Living with a design mistake which causes daily inconvenience is a real drag.

The goal is to have easy access to all seating and easy entry and exit from that seating. You should be able to push the chair back and leave the table without causing inconvenience to yourself or to others. Optimally you should have enough room for someone to walk behind the seating as well, think of young children sitting in those seats and a parent behind them cleaning up a mess or cutting their food or some other task.

This is your only eating area so it needs to work well. If you had a banquette and a dining room, then functional impediments in the banquette are not so critical. If you go with a bench, then this entails a tight squeeze from either side in order to get into the bench, and that's assuming only 2 people on that side, if 3, then someone is "pig in the middle" all the time, unlike with chair seating, where the person in the middle can enter and exit without disturbing the people seated on either side.

As I noted earlier, if you expand that bump out just a bit more, in 3 directions, then you look to have adequate room. Alternatively you can use a round table but then this cuts into the aisle space between dining and kitchen.

A few other points. Have you checked that your stairs are code compliant? The closet in bedroom 1 looks awfully large compared to the closet in bedroom 2. If you buy a stackable w/d and shrink the closet then this buys you 4 ft of additional K/DR space. Also, where is your front door? Having the stove on the island usually requires more complicated venting infrastructure. Have you considered a U-Kitchen with stool seating on the peninsula? You might be able to have this plus a DR if you push the K back 4' into the closet.