This evening I saw the biggest gecko i've ever seen in my life, he was in our WC, probably came in to shelter from the rain outside - the WC roof is made of steel, and there are cracks a gecko, even a big one, can get in through. This particular gecko was about a foot long including his tail, and a sort of blueish colour with red dots - very beautiful for a gecko! There are a number of smaller geckos living in the apartment, they hunt at night and you can hear them calling. I let them be - they control the insects, which is a bonus.
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a bit of further research reveals that this was a 'Tokay gecko'