My '84, 42' standard has (had) a settee there. Now it's a nav station.
You should be able to reach the water line by going "under", into the area under the salon floor. Mine is accessible from the hall or the cuddy. You really need to be familiar with that area anyway. there is a nice light in mine. hot water heater, sewage hoses, black water tanks, shower pan pump, macreator, fresh water pump, maybe some house batteries to boot. It's where I go to be alone also, (mine is carpeted & I just stretch out)