I’m a big fan of TripAdvisor. I always check it when booking hotels – it has a big impact on my travel plans. Of course some reviews are just ridiculous (marking a Spanish hotel down because they don’t serve chips, for example), but it’s usually a good indication of whether a place is going to meet your travel needs. Sometimes you want luxury, sometimes just a place to sleep. Things like location are usually key points I pick up on from reviews, plus breakfast quality of course!