Postgrad accommodations: Parish Rooms and Pillar Box

Hi everyone! I'm looking to book accomodations and starting a 1 year postgrad in Sep! 😊

Currently looking at these 2 places and whether anyone here has experiences with them?

I would love to hear about any good or bad experiences, especially about safety and the qns below since there isn't much info on these places online and both places have yet to reply to my emails sent a week ago.

Parish rooms- how do you receive parcels if you happen to be on campus at the time of delivery? Are Sainsburys' Local nearby alot more expensive than the Sainsburys' at city centre?

Pillar box - how much does a run of washer n dryer cost? Is there a long waiting time since I see that there aren't many machines. Can I hang dry my clothes in the room?