Hades wanted to ignore the summons considering he was a little busy with getting his new kingdom in order but the summons was less request and more order. The youngest stretching his power, asserting his crown so shortly after he'd won it. Tactically, it was a clever move. Hades just didn't like it. But he had little excuse. There weren't enough humans for him to judge yet.
He arrived in style, because dammit if he'd let Zeus take everything, carriage and horses and felt a little bad for it when he saw Hestia. But she should know what she was getting into, if she accepted his suit. There'd be no birds for him. He'd do this honestly, or not at all. He gave her a smile as he approached, then bowed. "Hestia. You look lovely." He hoped he was getting some of it right.