We did a loft conversion in a similar house to yours.
I would go for a smaller bathroom with shower and loo. If you make the bathroom smaller can you fit in cupboards for your clothes in that space? I actually used mine it as a drying space, and I know the people that bought it from us planned a washing machine.
Alternatively, if you don’t have a box room can you put in a ton of wardrobes in the loft bedroom? How often will you have guests? If not often then you would still have access to your stuff the majority of the time. Don’t forget the eaves will be dead space, so make that storage as well.
When we did ours there were a few things I was really glad we did.
We put a skylight in the front roof, and a Juliet balcony at the back. Because of insulation regulations lofts can get rather hot, so we wired in a fan in the bedroom. This meant in heatwaves, front and back windows could be opened for a cross draught.
The final thing we did was put in a bubble skylight at the top of the second set of stairs. The extra light it provided on the first floor landing was lovely.
It was great for visiting family who came from abroad and were with us for minimum 2weeks at a time. We weren’t on top of each other, and the bedroom was big, airy and roomy enough to take a sofa as well as the bed.