It may be helpful to state who these men are. AT: "two prophets who had lived long ago, Elijah and Moses, appeared" (See: [[rc://en/ta/man/translate/figs-explicit]])
"Peter said to Jesus." Here the word "answered" is used to introduce Peter into the conversation. Peter was not answering a question.
# it is good for us to be here
It is not clear whether "us" refers only to Peter, James, and John, or if it refers to everyone there, including Jesus, Elijah, and Moses. If you can translate so that both options are possible, do so. (See: [[rc://en/ta/man/translate/figs-exclusive]] and [[rc://en/ta/man/translate/figs-inclusive]])