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Hoover before any sanding too btw. And hoover lots before applying any oil. And hoover between different grits of sanding paper if you have the time.
I'd also take the time to strategise how/when you're going to finish it, as you really don't want any traffic at all in the first 12-24 hrs. And you'll be doing it 2-3 times.
On the flip side, it's a floor - so you'll probably forget about any imperfections fairly quickly.
We went for clear semi-matte, and I was happy with that. It will yellow the wood quite a bit. I'll dig out a photo in a bit for comparison (although that's on Beech rather than pine YMMV etc).
25-30m^2.
Thanks for all this, fantastic advice. No real photos of the floor as it's being installed right now, so I'm out of the flat for the day. The work started yesterday and they did install some of the new boards. I had a look and it's pretty flat. I guess one option is to very lightly sand off any dirt etc then try a coat of oil, if the finish is ok then go ahead with subsequent coats but if not I could pay someone to sand it for me...