When planning for a trip, before I book anything I do a small research and read what others have to say. Believe it or not, you might change your plans based on other people’s reviews. Trip Advisor is one of the best sites where you can find reviews about hotels, restaurants, bars, places, etc by others. I’m also a reviewer here, trying to describe my good or bad experiences somewhere I’ve been to. For most of the big cities, I download the relevant Trip Advisor app on my Android phone e.g. Athens Trip Advisor. By having the app installed on your phone you have all the data there and you can access it offline. Even if I’m not traveling abroad I still do this.