Meaning of 調子よい Maruko's grandad just agreed to do something but then discovered that it might be unpleasant. The narrator says: > **** ... > _From_ Maruko's viewpoint ??? even though he'd said it was a piece of cake, as soon as he heard that it was gross he gave the feeling of "...sorry but even I don't want to look at such gross things ... _etc_ ). I can't understand the meaning of here. I tried to translate the start as "From Maruko's viewpoint his condition was good and ...", but that seems to contradict the rest of the sentence.

means "because Maruko is in front of me.". () has the meaning of "unctuous". So is translated as "He unctuously said it was a piece of cake because Maruko was in front of him."