It had a perfectly round door like a porthole, painted green, with a shiny yellow brass knob in the exact middle. The door opened on to a tube-shaped hall like a tunnel: a very comfortable tunnel without smoke, with panelled walls, and floors tiled and carpeted, provided with polished chairs. and lots and lots of pegs for hats and coats – the hobbit was fond of visitors. The tunnel wound on and on, going fairly but not quite straight into the hill – The Hill, as all the people for many miles around called it – and many little round doors opened out of it, first on one side and then the on another. No going upstairs for the hobbit: bedrooms, bathrooms, cellars, pantries (lots of these), wardrobes (he had whole rooms devoted to clothes), kitchens, dining-rooms, all were on the same floor, and indeed on the same passage. The best rooms were all on the left-hand side (going in), for these were the only ones to have windows, deep-set round windows looking over his garden, and meadows beyond, sloping down to the river. 

This hobbit was a very well-to-do hobbit, and his name was Baggins. 

J R R Tolkein, The Hobbit