I'd say they're usually 3-6 earth masses? Smaller ones are possible of course, but otherwise you got the details right. Things may get supercritical depending on the pressure so the boundary between ocean surface and atmosphere would be fuzzy.
Greenhouse effect and atm pressure would probably be high so yeah, it'd likely be a "steam greenhouse" world at the surface at least at Earth's distance. Might be more habitable in the Middle Zone though (between habitable and outer zone).
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