After nine the ponds are still busy, and an escort address nearby is a staircase on a courtyard, not a bench. The walk around the water takes ten minutes and feels shorter than it is.
A meeting at the pond means standing in public while the flat is one courtyard away. The courtyard entrance is the useful detail, because several of them look alike in the dark.
Also in Moscow: Arbat side streets and Moscow City and the way back.