Hello,
I didn't know anyone when i started university, on the course or even at the accommodation, but you will soon meet people during freshers week and in lectures/workshop. However, i did meet one of the flatmates on the facebook group, so again would recommend joining that. Rooms of the second floor should be okay, but depends if you face the road or not. If you are 4th floor or above, alot of the street lighting does seep through so it depends which is of greater annoyance. There is washing facilities onsite, one at the bottom of the hill in the new part of the accommodation (bottom of the hill) and the older bit (near the reception area). The laundry services are run by circuit laundry, you will be given a card which you can top up online and use instead of cash. There are quite alot of washing machines, so its rare to queue for them.
Hope that answers some questions, again happy to answer any further ones about accommodation or the university.