Wikivoyage is the usual resource for this. Note that much of wikivoyage is targeted towards the backpacker world and is somewhat spammy so I wouldn't necessarily use it for hotel/restaurant recommendations, but it tends to be pretty good for basic stuff like airport entries and city transportation systems.

Wikitravel is very similar - I believe wikivoyage forked from wikitravel some years back, and my understanding is that many of the primary contributors moved to wikivoyage.