I saw the Trinity Rep production with the two pianos.
They had a wooden stage, the two baby grand pianos were facing each other. The back wall was made of brick. There was a spiral staircase on stage left, which led to a catwalk above. The front of the stage had stairs and ramps that went into the aisles. And there was a doorway to a bar.
The library was implied with two chairs, a recorder, and some books. Eliza's bed was the two pianos with a sheet over the tops.
I sat in the third row, dead center, in stadium seating. It was one of the most affecting evenings of theatre I'd ever seen.
How to properly use its/it's:
Its is the possessive. It's is the contraction for it is...