How dangerous is soldering?
Well, yes lead is unhealthy, and eating while soldering is not smart, but I doubt if it was not for an extensive period it will be ok.

Afaik the smoke is much worse, but it's not really needed to vacuum your room every time.

What I normally do while soldering (which is about once per month or less): open window (ventilation), and using a fan that blows the smoke away from me. I have a thick jacket so I can do it even in the winter (while window is open), and wash my hands afterwards (and not eating in between). Also the fan has a heater so in the winter that's an advantage too. Also make sure you do not inhale the smoke when you are close to your components to solder. In the few cases I accidentally forgot to switch on the fan and you smell the fume, strongly breath out.

However, there are better solution (a device that sucks the smoke instead of blowing it away).