The first thing the sword ever feels is the shock of impact and the taste of blood on his blade.
It's a good feeling.
There are other good feelings after that. Being drawn and swung is exhilarating; being polished and sheathed is restful. The world is a place of sleepy timelessness and pleasant sensations.
Slowly, he awakens to his wielder's sensations as well as his own. The feeling of motion, first, and then touch, and taste, and if he were awake enough to have expectations he'd expect that was all the senses there were, but he's wrong; there's hearing, too, and sight. Sight is a surprise. His first clear memory of having thoughts about his own experience of the world is being surprised by sight.
The next surprise, not long after that one, is when he starts getting echoes of thought and emotion.