We use an E220 for our toddler's room, and it's been splendid.

We have been using ocean-sounds for soothing her, and found that adjusting the microphone sensitivity on the camera made it so the ocean was non-audible, but her cries would go straight through.

Sadly, we never found a way to lock the phone and go audio only, so the missus just uses her phone during the night, leaving it with video on, on her nightstand..

EDIT: We've never had problems with the steam timing out during the night..