Well, gosh, I don't really agree with a lot of the more philistinic comments tbh. I also think people are forgetting this is London and no one expects to find light, airy, spacious property for sensible money. You clearly have taste and an interesting lifestyle and I think that's actually a saleable commodity in itself - given the architecture, what a buyer wants to know is that there are interesting, stylish people in the building and that by buying into it they can be one too. Over and above basic considerations like price and square footage, I think that's the essence of what estate agency is all about.
There are a few things I would change. For me the bathroom is a bit much but I think you would get away with the walls if you toned down the detail by, say, changing the mirror and the bath panels. Otherwise, I think your main problem is the photography. Many of the photos seem to be taken from well within the rooms, rather than wide, long shots. So the living room looks good but the other rooms look foreshortened and poky. Yes, pic 9 of the fire escape has to go (but long views from it would be good - maybe) and can you include a picture of the front doors as well/instead of the building exterior? I think I would want a sense of what 'my home' would look like, rather than just an impression of being 'on an estate somewhere'.
For me the genuine sticking points would be the lease length (can you extend?) and the potential for noise and pollution given your proximity to the tube lines and the Westway, but you can't change that and the flipside is that your connections are excellent.
Tbh, I wonder if it's just timing. Everyone says the London market is slowing (I'm not there anymore so I can't say) and while it's a fair price it's still a fuckton of money at a time of economic uncertainty. If I was in London and could afford that kind of money, I might be looking to move outwards instead but not necessarily be sure atm what my commuting/wfh situation will be going forward.
Good luck with it all. Your flower arranging is beautiful btw. 