Just right

A: Do you want to wash your face?
B: Wash my face! What are you talking about?
A: I'll explain. When your face is dirty, you wash with soap
and water in a washbasin.
B: What?
A: Yes, you wash with hot water but not too hot and not too
cold, just right, and then you get dry with a towel and then
you'll be clean.

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What's the best equivalent for "just right" in this text?

Thank you