He frowns a bit at that suggestion. The thought of staying in a new, unfamiliar apartment on his own and crashing at Jack and Ianto's seem terrible compared to just remaining out here for the foreseeable future. Staying with them is especially bad, the makings of a disaster (or a very sexy sit-com).
"Nice enough night for it. I'll be fine here." He gives Jack a somewhat puzzled look.
"Just where do you think I sleep back home? It's not like I got a flat... I've spent more time in mausoleums and sewers than a bed."
At least over the last couple of years, when he's become less and less picky. When he was with Dru he'd make the effort to steal a four-poster but they still lived in abandoned factories and ruins, rent-dodging squatters, one step up from being homeless in the street. Thus is the life of a vagrant vampire.