Absolutely fantastic dogs. We've had 2,we had our first for 5 years before she suddenly died and we recently adopted another. I've lost dogs before but loosing my greyhound hit me harder than anything, she really was my "sweetheart dog".
Our current is a failed racer and is only 2 so she's much more playful and lively than our old hound, who was 4 when we adopted her after she broke her leg.
I'm my experience, they are massive food thief's! Nothing not in a cupboard is safe, they can reach the worksurfaces and both mine would try and eat anything, my old girl ended up twice at the emergency vets, once for eating paracetamol out of my handbag and the other for pinching a mini box of raisins.
Several cosy, soft sleeping places are a must and they sleep with their eyes open so make sure everyone who comes in your house knows to call the dogs name before approaching them (or to leave them alone when lying down)
I've never been confident to let a greyhound off a lead in public. I do hire a secure dog walking field a couple of times a week, you can usually find these near you on Google I pay £5 for 30 minutes but she's lying down shattered after 10 🤣
I adore greyhounds. There is something about the way they look at you and their calm and gentle nature, along with the sad start that so many of them have in life that I think makes them so special.