I am currently living with my first roommate, and I have to say everything is alright.
I was very afraid of this situation, but had no choice. Where I live, everyone shares their flat. And finally it is a positive experience.
The first week I did not dare going out of my room even to pick up something in the fridge, and did not dare to use his things (cooking pans, plates..). I did not talk much to him either.
Now I feel home, I am rarely annoyed, thought I am the kind of person who cannot spend one week at their parents' without being continuously pissed.
My roommate is very easy-going, and half of the time he is away. He is sometimes travelling for a week or two. That is also quite nice
On the other hand, I do not know if he is satisfied with me as a roommate. I am very quiet, very tidy.. but maybe he is expecting more communication. No idea. For me this is ideal ; I do not have to speak when I want to be alone, but I still have a kind of company not to be completely isolated.
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"I'm astounded by people who want to 'know' the universe when it's hard enough to find your way around Chinatown." - Woody Allen.