granadaforo

Backpackers Hostels offer dormitory accomodation with a locker to put your possessions.
They normaly have a comunal kitchen which you can use to cook your own food.
They usually have free wifi, most of the guests are under 25.
The price is normally around 17 euros per person per night.

Here are the main ones in Granada

Oasis backpackers hostel in Granada center
http://www.oasisgranada.com/en/default.html

Makuto Guest House Granada
http://www.makutoguesthouse.com

White Nest Hostel Granada
http://www.nesthostelsgranada.com

Funky Backpackers Hostel - Granada
Seems to have very bad reviews and I can't find its own website.

Note:

There is a list of cheap hostals and pensiones here
Click here for Cheap hostals and pensiones in Granada/url]