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If you make sure the straw is in place well, when the lid is closed, it is “leak proof”. However, if your child likes to mess with it, it WILL leak everywhere. I don’t know why “warmth” is an option to rate, because it specifically states not to put anything warm in the container. It also isn’t clear if you can put it in the dishwasher, but since it is stainless steel, I haven’t. So, I would say no, it is not “easy to clean”. However, my kids love to drink out of these thermos cups.
It flooded my daughter's school bag three days in a row now, after only using it for about a month. The bottle was completely closed while it happened, so the water leaked from a closed bottle. It does keep the water cold so as long as it is place upwards, it should be fine.