Tried to see how the same kind of map would look like with the tools I used before, but I used a metric template and a have an 1m grid instead of the 5' one. Sorry, it is my mistake

Sorry for just copying your content (and adjusting where it was important) and not coming up with something original, but I thought this way I could show some of the differences between tools and also I could offer some feedback about your maps.

Click image for larger version. 

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As you see this image is more like a simple handout, no grid or anything like that. As you can see I done some very quick draft sp the stairs aren't that nice. But tried to answer something.

When I seen your draft, I asked: People who go "upstaris", how they leave stairs? One of the sofas seems to be in the way, and the other one would be in the way of the people who try to use it. Right now, you see how I would try to fix it. of course, if you would make the 2nd part of stairs 1 square wide, it would be easier to make enough space for everything.

I think I should have made my stairs even longer (and a bit more narrow).

But the real difference is visible on the 2nd map.

Click image for larger version. 

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It is easier to see the difference between grid lines and the walls! I think most CAD programs could do something like this

I have used Microsoft Visio to make these maps, but I am sure the same thing is possible with both Campaing Cartographer (Symbol set 3?) if you want more artistic apperance, and any kind of CAD program that can be used to design floorplans.

I think both Microsoft Visio and Campaign Cartographer can be easy to use if you are used to CAD software (and the rest of the office suite if we speak about Visio). And Visio seems to be affordable (and part of the office family).