Ron had to admit that living alone was boring. When he had moved out of the Burrow, it was because he wanted to give his much younger mum and dad their own space, but also because Harry was there. But then Harry vanished and Ron was, for the first time, by himself. Well, he guessed he'd have been by himself in his own time after he walked out on Harry and Hermione, but he hadn't lived through that yet, so it was still a new experience.
Still, that wasn't the main reason why he was happy Harry was back. The reason, of course, was that Harry was back. Nothing more was needed.
As soon as he heard the knock on the door, he rushed to open it. "Harry!" he shouted. "Look you bloody long enough."