Gratis, this is not a joke...

It is true; you can be lodged without any charge in the most expensive cities in the world. Just join a club, a sort of community of Internet users, help each other. The principle is to register on sites like here rahhala.net, hospitalityClub.org, etc, and then you can contact all members of this club (thousands) around the world asking them to accommodate you, without necessarily having to make the service to the same person. You are free to do the same in the future (lodgings, information, etc.). It's effective, simple and free. Use rahhala.net and get imported to discover the world...
Here are some other sites:
Click here to create an account in hospitalityClub: www.hospitalityclub.org

Click here to create an account in CouchSurfing: www.couchsurfing.com

 

In Europe ?

The cheapest way to lodge in is Youths hostels. There are two types: the governmental hostels and the privates. On average, it takes:

* On average a single room in a hostel (youth hostel): 15-22 euro per night
* On average a single room in a hotel: 40-50 euro per night

                                                                                                    See website of Youth Hostels

In Asia?

In Asia, the cheapest way to lodge in is hostels. The quality of hotels or hostels depends heavily on the region.

* On average a single room in a hostel (youth hostel): 1-3 Euros per night.
* On average a single room in a hotel: 5-20 euro per night


                                                                                                    Click here to read more

In Center & South America

In South and Center America, the cheapest way to lodge in is hostels. There are two types:  the governmental hostels and the privates.
 
* On average a single room in a hostel (youth hostel): 15-22 euro per night.

* On average a single room in a hotel: 30-50 euro per night



                                                                                                    Click here to read more

In North America

In North America, the cheapest way lodge in is hostels. There are two types: the governmental hostels and the privates.

* On average a single room in a hostel (youth hostel): 15-22 euro per night
* On average a single room in a hotel: 30-50 euro per night

                                                                                                    Click here to read more

In North Africa

In North Africa, the cheapest way to stay is hostels, and hotels as part of a tour group. On site, hotel prices change and are very high, so it must be all book on the outside otherwise use youth hostels (and camping)

* On average a single room in a hostel (youth hostel): 10-30 euro per night
* On average a single room in a hotel: 40 - 50 euro per night .

In Australia

In Australia, the cheapest way to lodge in is hostels. There are two types: the governmental hostels and privates.

* On average a single room in a hostel (youth hostel): 30-40 euro per night.
* On average a single room in a hotel: 40 - 50 euro per night

                                                                                                    Click here to read more