If it helps, OP, here are some good points:
- I like the new bathroom. It shows up well on the house tour and looks clean and calming. Ditto the extension: the views on the house tour are absolutely lovely.
- I like the extensive office space. It legitimately looks like a place where two people could work from home, with two teenage children also working from home, and there would be no murder. (Each of you in an office, plus the children in the extension and sitting room.)
- The location is great.
- There's reasonable closet space in a house of that size.
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I don't think you have to go "all girly." I think you can be plain and simple. Even in the delightfully amateur photoshop from the PP, you can see what a wonderful difference white paint, light prints, and no tablecloth would be.
I think for a reasonable amount of money, you could replaster the ceiling, redo the horrible green carpet, paint the stair rail, and paint at least the downstairs walls. I'd go bright white for the dining room to catch the light from the back and something lovely and jewel-toned for the front, like a good mustard. Or, if that's too dark, something simple, like a decent sage.
For the floors, put down something simple and clean. Frankly, I'd do wood, but if that's too pricey, pick a nice, low plain carpet in a light, neutral tone.
The furniture is very heavy for a house of this size. It makes reasonable spaces seem cramped. So, in the room with the mirrored closet (and I shouldn't lie--I abhor mirrored closets in a bedroom), it looks like there's no space, and ditto to the living room. There's perhaps less you can do about this unless you want to hire someone to come in with rented furniture to stage the house, but it might not be worth the price.
I have to completely agree about the loft conversion, which looks really problematic. Anything you can do to cover the access space to the water heater, you should. That seems an ideal place for a wardrobe! It gives me skin crawl, as all I can imagine is spider nests. And the en-suite is a total mess. Whether or not there's mould, it seems like there is mold. At minimum, it needs to be repainted in a high-gloss white, ideally with the grout bleached too. As it stands, even if downstairs were completely redone, it would be a dealbreaker for me.
Yes, in a perfect world you'd knock through the kitchen/diner wall, but that's a huge expense and mess. But right now, what you have to do is make it seem less shabby. This isn't a matter of taste alone--it's a suggestion that the house is well taken-care of and solid. Re-plastering, painting stains, recarpeting will all help. Make sure that the lights in the the light fixture have bulbs! (There's at least one missing in the tour.) Again, not just taste but care.
And then you can dress it, try to de-beige it, put some outside furniture on the mysterious circular patio (?) in the garden, etc.
But the biggest help will be knocking the price down. I'd try to get it under the £350 mark for search engines. Even if you go £349--it's going to put you in a different grouping. It may be overpriced even for that.