Airbnb
Another good accommodation alternative, this site connects with homeowners who rent out their homes/apartments to you. You’ll get all the comforts of home, the chance to stay in a local, non-touristy part of where you are going, and pay a fraction of the cost of a hotel room. (If you’re new to Airbnb, get $35 off your first stay!)
Agoda
An amazing website for accommodation in Asia. This should be your primary accommodation website for guesthouses and hotels in Asia. They have the most robust inventory and offer the best rates. When I travel around Asia, I don’t use anyone else. (As a reader, get 10% off your booking with the code AGODANM10.)
Booking.com
Booking.com provides great resource and booking site for cheap hotels and other accommodation. I like their easy to use interface too, wide selection, and no money down policy. They are especially good for listing in developing countries.
Hostelworld
The best hostel accommodation site out there with the largest inventory, best search interface, and highest availability. I use them for all my hostel bookings. And, since they bought their competitor Hostelbookers, they are the biggest game in town.
Couchsurfing
This website allows you to stay on people’s couches or spare rooms for free. It’s a great way to save money while meeting locals who can tell you much more about a city than you will find out in a hostel/hotel. I have used this website dozens of times and the site also has groups where you can meet up for events in your city.
Priceline
One of my favorite hotel sites because it allows you to bid on hotels and save a lot more money than just by booking directly. When used in conjunction with the bidding site Better Bidding, you can substantially lower the cost of your hotels by as much as 60%.