At this very moment, not safe for young children, but it would take me about 30 minutes to make it reasonably safe. I have a package of electric outlet plug thingies for when young children visit that I can put in outlets throughout the first floor. I would have to move cleaning sprays up from underneath the kitchen sink, laundry sink, and I have a couple things under my bathroom sink I would just move to the laundry room. I also have medications in easy reach that would need to be moved higher. Lastly, I would block the stairs so they could not climb up them. I can completely block them, I use it in the winter time to not have to heat the upstairs.
I have very few sharp corners, especially at low heights. No square coffee tables, nothing like that.
If someone visits with children for a few hours I would not do any of these things, assuming the child would always be within our sight. When people visit over night I take the precautions.