We actually had almost the same, weren't you offered that one? The only difference in your sentence is "this morning" instead of "in the morning". Added.
"stůl" is trickier because it has two forms in the locative (like many other nouns) -- "-e" and "-u", AND it also features the letter "-ů-" which changes to "-o-" when declined (like "dům", "sůl", "nůž" etc.).