1.    Affordability and
2.    Comfort

There are some people who have been cheated that these two factors can never apply when you are seeking group accommodation. This is never true though. There are several instances where you would get offers that just make this type of accommodation to be quite affordable.

You are seeking to impress and most likely to tighten the bond that exists among the group in question. So, when they are comfortable, they would be more interested in the trip and they would find it wise to interact even more and get to know and understand each other better.

So, the London hostels that would end up as your chosen accommodation type should have these two elements. Otherwise, no one would like the idea and you would not just wish to be part of the mess. Plan wisely and enjoy the accommodation.