Worth checking - some universities won’t allow toasters etc in halls which is bizarre as they’re fine for people to have hair straighteners!
Burned toast is notorious for setting of fire alarms.
For my niece, quite a few years ago now, I made her a 'bag of requirement' stolen from the 'room of requirement' in Harry Potter.
flip flops - for the bathroom and possibly the kitchen depending on how clean he/his flatmates are.
spare mobile phone
hat and gloves - they go to uni in warm weather but don't come home until it's freezing
tin opener
corkscrew
emergency chocolate
sanpro (yes I know not needed for a boy)
prepaid tesco card
toilet roll
picture frame
blue tack
drawing pins
oven gloves
It was all packed in a weekend bag
One tip I have heard is to get crockery and cutlery from a charity shop. All the ikea stuff looks the same so goes missing or is used and not washed. Old fashioned granny flowery plates are easy to spot.
New duvet, pillows and bed linen. Include a couple of cushions that can be used to sit on.
List of names and addresses of family if he is going to send birthday cards/buy presents.
List of vaccines, medical records etc, he will be signing up with a new Dr and dentist, knowing medical history can be important.
A lamp, there is usually one in halls but you really need one for the desk and one for the bedside table.
DS had a 4ft bed in halls so we had to buy 4ft fitted sheets, which are not easy to come by.
Learn to do hospital corners, they stay on the mattress better than fitted sheets and you can use large sheets on a small bed.