Why don't you wait a few days to see if you really are "blacklisted".
When Google is updating site position may move around a lot
I seem to have been blacklisted, or at least completely de-ranked, from Google for searches for 'property'. I went from the top 10 down to... who knows? Anyway, I can only assume that this is down to keyword stuffing. Despite the fact that I haven't intentionally stuffed the keyword 'property' into the page - and it's in the domain name as well, which doesn't help when I need to print the site name on the page.
Now I can remove the word as much as possible but it'll be to the detriment of the user. Is there any way of putting in an appeal with Google or what?
I've seen worse
I've also seen it recover
Check your logs carefully
Was your website up all the time?
If the site was down or slow when the bots crawled it might explain part of the issue
I see you at no.30 on "pages from Ireland", so you're not banned...
I don't think you've been penalised at all.
Google tweaks their algorithm now and then. This can affect rankings. Also, websites which have better SEO than your website can overtake you...