How to use "concierge" in a sentence

One evening, having followed them to the house and watched them enter, he went in after them and spoke to the concierge

The concierge, however, became suspicious, thinking that Marius was connected with the police, and refused to say anything.

He knocked on the door and spoke to the concierge.

The concierge then recognized Marius from the previous week

'Come in,' Marius said, expecting it to be the concierge, Mme Bougon

'Has the concierge gone out?'

Early the following morning, he paid the concierge his final rent and went to live with his friend, Enjolras