Oooh, a house call... that's when you know he's serious. That could work, or he could run into her on her way to Tsunade's since Ino might have mentioned her training with Sakura under Tsunade and how it's going. No option is a wrong one here. I will take Sakura's home or running to catch up to her while she's on her way to work with Tsunade. Maybe her mother told him he just missed her, etc, etc.