Hostelworld accommodation reservation service offers free download in PDF format (opens with Adobe Reader) of a series of city guides, basic but practical as the first approach to your destination.
They do not replace the largest and most traditional (or prior browsing through blogs and Internet forums) but if you go on a weekend trip to a city, or if you are in another country and want to leave the guide of the hostel in 300 pages you bought in Spain, you can opt for them as an alternative. Between three and six pages (plus one of cover and advertising) they present the basic data for a stay of two or three days in any of the 39 cities that make up, for now, their catalog.
They are available, in English from what I have seen, for the following cities in Asia, Europe, the US and Australia:
Bangkok - Beijing - Hong Kong - Kuala Lumpur - Singapore - Tokyo - Amsterdam - Athens - Barcelona - Berlin - Bruges - Brussels Budapest - Dublin - Edinburgh - Florence - Galway - Interlaken - Krakow - Lisbon - London - Madrid - Milan - Munich - Naples - Nice - Paris - Prague - Rome - Stockholm - Valencia - Venice - Vienna - Boston - Los Angeles - New York - San Francisco - Auckland - Melbourne - Sydney
I have downloaded two to take a look, one from a city that I know quite well, Dublin, and another from a city that I practically know nothing about, Athens (which will be where it lands this Friday for a ten-day mini-vacation in Greece and of which I will write, of course, to give you data and practical details).
In the case of the Irish capital, the information is quite correct although logically, for reasons of space, it is limited to the most obvious and known. For example, the Elephant and Castle restaurant does not appear (it is essential to try, accompanied, the cube of chicken wings with spicy sauce) in Temple Bar, nor the Dandelion, a disco in St. Stephen's Green, where you can dance with the girls more beautiful city (or, at least, delight the view).