That was the ONLY thing that made me really twitch!
And weirdly, unless I'm mistaken they are all almost all travel books that are colour coded. That DOES make it slightly less awful, as it makes more sense to have all your lonely planets next to each other, all your bradts next to each other, all your rough guides all together etc etc to a certain extent. (However there are lonely planet blue books on various different shelves).
There's overkill on the distressed wood effect and a few too many patterns, which I think adds to the cluttered feel - but I really don't think it is. I think the wood makes it feel smaller than it is. As do the large about of pictures and unlimited colour pallet.
As for the 'cosy, homely feel', its definitely taking personal elements but I don't think its homely. Its too ordered and deliberate to be homely. It screams professional interior design job. You can't imagine it being 'lived in' and there ever being a box full of lego tipped everywhere or kids leaving shit everywhere. Its still a show home not an actual home. Where's the kids books? It doesn't fit. If they moved somewhere else last year it does make more sense - but why keep the house for so long and with all the knicknaks still there either???