Suitable accommodation ?? Help!

[BePearlMaker]

Is a bedsit (no rooms other than bathroom) suitable accommodation for my 6 year old, her dad (she sees once every 2 weeks), his new girlfriend (my daughter has met once) and potentially her child too?

Am I being unreasonable to say this isn’t suitable accommodation and to stop overnight stays and proceed with long day visits instead as it puts her at risk and discomfort?

Dad and daughter I think would be ok, although I'd be concerned about how she's going to go to bed at a sensible time for her age when there's only one living space.
Absolutely not OK with a woman she's only met once and another unrelated child. How long has he been in this relationship?

He refuses to tell me anything! I don’t know anything about her at all (not that I necessarily have to know, but I want to protect my daughter)

Is the bathroom shared or unsuited?

If it's shared I'm afraid it would be an absolute no from me. The safeguarding risk is just too high.