I visited for breakfast. Breakfast is available from 7 to 10. It's inside 東京グリーンホテル後楽園, but you can enter even if you're not staying at the hotel. However, you need to purchase a breakfast ticket at the hotel reception before entering the cafe. Breakfast is a buffet for 700円. All-you-can-eat 4 types of bread, scrambled eggs, potato salad, green salad, yogurt, and sausages!! I remember the drinks included coffee, orange juice, and milk. It's not astonishingly delicious, but considering it's a breakfast for 700円, I think it's astonishingly good value. My favorite was the white roll. It was fluffy and soft, and the sweetness of the butter spread through my mouth. I'd like to eat here again when I'm nearby!

Apparently, only hotel guests may use it.