As @BananaBagel said, he has a nine to five job. I think he has a few regulars that keep him engaged, In case you are looking for an incall, he has a roommate who travels a lot but lives at the apartment. That could be an issue to some clients.
But I agree, if his profile states 'available now', he should respond to inquiries. Even if it is only for appointments at a later date if he is currently too busy.