Sorry for the very delayed response - I rarely check in here. You most likely have made your decision already. I have traveled 'solo' with Olivia multiple times - even though I usually am traveling with friends. Sometimes I've sprung for the 'room to myself' and other times I've let Olivia assign a room mate.
They do a thorough job of asking questions about your habits and likes and dislikes and then match you appropriately. I've enjoyed both of the women assigned to my room and didn't have a problem with either. And now I have one lovely friend from Canada and another from New Zealand! Olivia, with your approval, will also provide email addresses so you can check in with your roomie before arrival.