ZenRooms is your go-to website if you are looking to book top budget accommodations. They promise lowest rates (up to 30% less comparable properties) and what you see is what you pay. There are no hidden fees.
The differentiating factor with ZenRooms is they guarantee the quality of the rooms to ensure happy customers or you get your money back (this is published on their website). They also boast the most generous loyalty program where if you stay 6 nights at Zen, you get 1 night free.
ZenRooms is a Rocket Internet venture.