Teddy was a bit surprised at Victoire's letter. He wasn't expecting to her from her. Ever. Ever again really. But it was something he couldn't ignore even if he wanted to she didn't feel safe, and he was actually glad that she asked him to help rather than being stupid and going off to take care of it herself. He sent the owl back saying he'd be there any moment.
He apparated down the street, that way he could take a small look around before getting to her flat. It looked quite normal so far. Maybe she just wanted to talk. She was stubborn so she wouldn't just come out and say that. Although he didn't think she wanted to talk to him this soon after their incident.
He knocked on her door and turned around facing the opposite direction. His auror training was kicking in, and he scanned the area to make sure nobody would come up from behind him.