Torches and oil or candle lamps. Tapestries hanging on the walls for warmth. Large heavy banquet tables. A kitchen with a huge fireplace and hearth, and dogs to turn the rotating spit. A huge stone oven for bread. A map and document room filled with scrolls made of parchment (sheepskin). A stable for the horses, both light and heavy. A room for storage of armaments such as spears, arbalests, crossbows, longbows, swords, and armor. This is only a small part of what would be in the main castle complex.
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i would say that in a medieval castle you would find a king, queen, princess/prince, court jester, servant's, chief's.
I would suggest Wikimedia Commons. If you follow the link below, you will find a wealth of links to subjects, each of which has links to medieval pictures.
They had games, dancing, feasts, music, and other things they could find to have a good time.
Because Medevil houses were made out of things they could find, they're weren't hardware stores then.
Warwick Castle was used, for most of the Middle Ages, as a prison. Among its residents was Piers Gaveston, who remained there from the time he was captured until he was executed. It was also used for storage of provisions at various times. I cannot find that anyone used it as a home, but it might have been so.