By accident I strayed onto Multimap today, rather than Google maps which I invariably use.
Wow. It’s been updated with many features since I last looked. Most notably, though they’ve added some useful overlays to pinpoint things like cash points, parking lots and best of all Wifi hotspots.
The wifi hotspots are both paid and free ones it appears. This may not be the only place you can find hotspots data, but it’s certainly a very convenient feature.