An apartment with a kitchen means that Giles can start cooking for himself: things that he can actually eat. Last year he subsisted on multiple sub sandwiches a day from the cafeteria. Dairy-free is hard to do.
The Composer took him to the supermarket before leaving him for the year, and with his list in hand, he did what may have been his first grocery shopping (not counting the odd item pick-up for me now and then).
Except for the burner catching on fire (someone else's old grease apparently), all went well. And he sent a picture of his nicely-plated dinner to prove it.