If you want to see where you will be staying before you actually book the location, visit an online travel agent to book your hostel stay. They can provide you of photos of the location, of the hostel room and even provide you with a description of everything that is included.
To find out if a hostel is worth your money, find out what other consumers have thought of it. To do this, simply use the web to look for customer reviews of the location. This can help you to see if the location is clean, comfortable and worth your money.