I don't know if it is because I am an only child or just appreciate being alone, but I don't usually ask for extra care (like from friends or family) when I'm solo-parenting so that I can have quiet time to myself after she goes to bed!
LO is very, very easy though, as far as toddlers go. So once she is in bed, I can usually have a few hours to do what I feel like/need to do around the house.
What do you prefer? If DH goes out of town do you want/need extra hands? I'm guessing this gets a lot harder when you have more than on LO or an LO who is high needs.