If you are wanting to almost start over, I would paint in a soft blue or soft blue/green or soft green. These colors are restful, soothing and inviting. Wood floors will be great. I would get white bedding and maybe some colorful shams. White will work with anything else. Move the bed in the center of the wall. I would repaint the nightstand white and move it closer to the closet to be able to center the bed. Get another nightstand same height. Or get two new white taller night stands. You could get a small desk to go with the chair. Paint the chair white. Maybe window panels in a semi-sheer woven frint fabric. Place a dressing mirror on the back of the door. Take the colors from the drape for throw pillows on the bed. It will feel bright and fresh, yet restful. Something like this feeling Wall color and bedding

I understand what you want to do, so here's my suggestion, if it fits.....I'd move the couch under the mirror. Move table to the center of the kitchen, like an island. Sounds like it's two adults and two toddlers, so I'd definitely remove two of those chairs. Are your kids in high-chairs, if so move the other two chairs out too. Basically you want four chairs not six. Move them to a garage, basement or another room. Put the chairs around two or three sides of the table. I'd leave the side near the stove and washing machine(?) open. TV would mount to the right of the back door. See if that would work. Either way, it's going to be a tight space. Post pics please.

I agree with maikola, turn under the stairs into storage. Maybe combine with a little desk for when the kids are older. I'd swap your dining and living area around. Have the tv on the long left wall with a small sofa a couple of feet in front of the doors and one opposite the tv. It does look as if a 5ft table would fit in the kitchen though? If you don't want to fill too much of the kitchen space consider a bench one side for you to use with chairs for the kids on the other. The area outside the kitchen could then be for the kids to play

East Kent Eco - again thank you for your input. As a pro I wonder if you could offer your thoughts on a couple of scenarios 1 - Leave bath where it is - what would be involved in moving the shower 4-6 inches to the centre of the bath? I did consider the P shaped bath and will consider your suggestion for a shorter bath to allow room for the toilet, but I currently had to put in a door stop to protect the shower door from the entrance door handle and I would be concerned about a rounded door being even closer. If I left the bath where it is I have a couple of options, turning the toilet and cistern 90 degrees to the adjoining wall - see above for the considerations there, or I have also considered switching the toilet and sink. I would put the sink facing the wall where the cistern currently is have a large-ish vanity from the base of the bath to the wall, and the if the toilet was where the sink is it would not interfere with the doors for the hot press as the seat would be considerably lower than the sink is currently thus giving me the better access I want. In this scenario the main issue for me would be the toilet would be facing the entrance door, a bit unsightly but if it gave me the space I want I think I could live with the compromise. 2 - A bit more involved, but I have also considered moving the bath sideways along the short length of the room, shower end over the space where the cistern is currently and moving the sink and toilet to the space where the bath is currently. I think this would allow me room for a vanity and maybe also a tall storage cupboard for the towels and linens currently in the hot press. The obvious concern with this is the shower spray in the direction of the hot press, if I got the storage I needed elsewhere in the bathroom I wouldn't be concerned about those getting wet, but would want to ensure I don't end up with a leak over the stairs. Access would also be an issue if repairs were required for the shower pump or the hot water system. You would have to step into the bath to gain access. Is there a solution to waterproof the cupboard?