Which noun has been replaced by it it was a warm and cozy and when martin drew the curtains she felt safe and protected?

The noun is missing:

It was a warm and cozy _______, and when Martin drew the curtains, she felt safe and protected.

It was a warm and cozy evening (?)

It was a warm and cozy room (?)

It was a warm and cozy atmosphere (?)

Whatever the Word that was in the blank space is the noun that 'it' is replacing:

'The evening, it was warm and cozy...'

'The room, it was warm and cozy...'

'The atmosphere, it was warm and cozy...'