HOTELS IN LISBON

I would like if someone can recommend me any good and cheap hostel in LIsbon? Im planning to visit PORTUGAL in 10 days, which cities can you recommend me? Im thinking about my itineray as follows:

2-3 days in Lisbon
1 day Sintra
1 day Cascais and Estoril

1 day Coimbra

2 days Oporto

1-2 Guimaraes or Braga??

Check out hostelworld for hostels in Lisbon.

Are you relying on public transport? What you can see on foot can be walked around in a day. A car is needed for much of the city.