Old Street Hostel (now seemingly called Green Street Hostel) is a good enough place to stay if you want a cheap option with private rooms in the old quarter of Hanoi. The rooms are very basic with no frills. Breakfast is included in the room fee but it is very basic (white bread, greasy eggs, instant coffee). This is not a bad place. I would say it is probably average in its price range in Hanoi. I think I paid about $18 USD for a private room. As with most places in Vietnam (and southeast Asia in general), there was no shower or bath tub, just a shower head in the bathroom. The hostel did have free wifi as well as two computers for guests to use. The wifi is standard but, in my experience, not all hostels had computers for guests to use.
The hostel will book trips for you if you want. I didn't book anything through them because I had my own plans of things to do.
Overall, a decent option if you're traveling on a budget and want to avoid the "Spring Break" party atmosphere at some other hostels such as the Backpackers Hostel.More