Well done on getting the rent. Excellent news. You won't want to hear my next advice, do not show it with sitting tenants, it's just a mad thing to do in my experience.
And no you of course can not enter their property without their permission - absolutely not.
If you really really want to show it, then you could 'try' to arrange it with the tenants, and this will backfire spectacularly as they will be in bed or out or wearing underwear or 10 unknown sleeping students on the couch and floor surrounded by beer cans.
You can however put it up on daft, and put up your previous good pictures and state it's not for viewing until x date. I assume you're going to have to paint it, so organise that now. I'd also gift the tenants a few rolls of black bags, j cloths and jif - you might be lucky !
I think you should count your blessings you got the rent and be prepared for some scrubbing.