I totally understand what you're saying. It can be tougher to make friends when you live in a place where meals are provided because you don't have as many chances to talk to your roommates outside of eating times. But when you live in a regular flat, you all share the same space, so you're more likely to spend time together in the kitchen, living room, or even just chatting in your rooms. This makes it easier to become friends and get to know each other better.