And thus so was the criminal that Jesus had spoken to. Sheol was the name for the grave of Psalm 16:10, what Peter called Hades in Greek. Or hell in English. No paradise there.
I have often heard hell described as being cut off from the Presence of God. It includes a great deal of real torment so I don't minimize the actual place but the real hell is being without God. Going with this definition, I think it interesting to believe that the thief went with Christ on His mission to Abraham's bosom. There, all were treated to Paradise in the Presence of their Savior.
May God bless you.