I agree, the listing needs work. I almost automatically assume that if dimensions aren't on the floor plans, they are trying to hide that the rooms are small.
Second, I don't think the photos are doing you any favours. Overall the angles aren't the most useful or flattering to the space. The kitchen looks incredibly dark - this is a fairly easy fix! it's a lovely kitchen, I've just taken a screenshot as we're planning our own new kitchen at the moment.
In the bedrooms, it's clear that under the high sleepers the carpets have faded differently and that really draws the eye and make people think they'll have to replace them - can you get some big cheap rugs for under the beds?
On the room with the sofa bed - why is it made up as a bed, rather than just being a sofa/office style set up? It makes the room look cramped.
I'd also take the desk out of the bay window for the photos and put a small armchair there instead - otherwise you're drawing attention to the fact that you don't have enough space for a dedicated office.
I'd tidy a bit more for the photos - handbag on the back of the living room door handle, rug over the chair at your dressing table, mirror on the floor in the sofa bed room, loads of bottles out in the bathroom. Don't give people any chance to wonder if there's enough storage.