They're obviously going to need a bed, chest or drawers, wardrobe (could be a fabric one), somewhere to sit and a small table could be handy for working at, putting things on. If you have room for a small fridge, that's great - it'll relieve the pressure on your own fridge.
Many will have to share kitchen and bathroom facilities, so I wouldn't worry about lack of ones for their own use.
They'll obviously need a quilt, covers, pillows, towels. If money is getting tight after providing above, don't forget they'll be in receipt of state benefits so can buy extra towels, bedding. If you can, a small box of essential toiletries to start them off - shower gel, shampoo, toothbruth, toothpaste, deordrant, pack of sanitary protection if a lady is coming, as well as a couple of treats - biscuits and chocolate and perhaps some fruit. There's not an expectation to provide food for whoever, but I'd expect this to happen for a few days until they receive benefit and have had chance to adjust and find out were local shops are.
You are being very thoughtful, yes a worktop, kettle, microwave if you have space and the money.