Ditto. Only drawback is they tend to help themselves to food if you are daft enough to leave it within reach - and most can reach quite high up! They are not natural thieves, but when kennelled have only had acces to food that was for them, so they think they can just help themselves.
A nice warm bed - a double duvet folded in half is fine - and good food - they appreciate a breakfast (cereal and powdered milk such as lamlac) and a soaked evening meal of meal and biscuits (you can get greyhound complete food quite cheaply from any pet supermarket) just add meat or scraps from your meals. A nice knuckle bone will help their teeth as often they have grotty teeth having had sloppy food most of their lives. A warm coat for walking out in in the cold weather. Two will keep each other company and they hardly take up any more room (until they stretch out!). Most of them walk nicely on a lead, and they have had all their vaccinations, and they are only being rehomed because they have either finished racing or didn't take to it, not because they have been problem dogs. Easy to groom, just a quick rub down with a chamois leather or soft brush once or twice a week.