I would only accept the takeback when it is clear that the opponent made a mouse slip. Otherwise, I would decline it, because it is not fair if the opponent moves but sees that it is a wrong move and so proposes a takeback.
For example when the opponent moves the queen, but later sees that it can be eaten and so proposes a takeback. I would decline it.
For example when the opponent moves the queen, but later sees that it can be eaten and so proposes a takeback. I would decline it.