Yes, it is safe...as long as nothing is pressing on the cord itself, like a furniture leg, etc. As was already said, running a cord under a rug without a protective raceway is dangerous, but just having a cord/plug under a sofa is fine. Just make sure no part of the cord is where people will walk, so it is not a tripping hazard.
The duplex receptacle on the floor is usually wired so that one of the outlets is constantly "on" and the other outlet is governed by the switch(es). This way if you have a sofa or chair run by electricity it could be on constantly, and you still have one outlet for a lamp that could be turned on/off by the switch(es).
Hope that helps!
Frank
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Florida licensed Home Inspector #HI688. (352) 250-7818
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