At such an early stage, I think an apartment works quite well. My cofounder and I share an apartment (with a couple other friends) and things get done. Integrate your startup with your life because the startup is your life if you're serious. But it really depends on you as a person. If it's just that you're somebody that needs to be supervised/forced in a specific environment to be productive, then you might reevalua…
I don't see it as black and white. Everyone has their conditions under which they work at their optimal level. Identifying those conditions and finding a way to make it work I think is more important than forcing yourself to work under difficult conditions SIMPLY because you are a start-up. There is a huge misconception that just because you are a start-up you HAVE to make your life difficult. It already will be diff…
This only goes so far though. Daniel's probably right that you're in trouble if you require another person to motivate you to do work, but I don't think that's what you meant in the first place.