I think the closest I come to having something permitted to roam is that I will often take my bigger snakes into the bedroom, lay them on the bed and close the door while I clean their tubs in the other room. The vents in my apartment are all at ceiling level, and about the only thing in the bedroom is the bed. However, as soon as the tub is cleaned, they go right back in. We're talking all of 5-10 minutes.
It's not a good idea to let herps roam, especially with other pets in the house.
1.1 Jungle Carpet Pythons- Kuno & Sydney, 0.1 Turkish Sand Boa- Ankara, 0.1 Anery Kenyan Sand Boa- Chani, 1.0 Axanthic/het for snow Kenyan Sand- Muad'ib, 0.2 Ball Pythons- Tora & Talina, 1.1 Kunishiri Island Rat Snake- Asuran & Cagari, 1.0 Leucistic Texas Rat- Mitsu, 0.1 Banana Cal King- Chanel, 0.1 Albino Oketee Corn- Harp, 0.1 Gargoyle Gecko- Mist