Hi, from your post I can see two separate problems.
1) NoM thinks the floor is under water. The problem here is that the floor
is under the water level, even if water is disabled in the cell. If you enable water in the CS, you'll see that it appears above the floor.
To solve this problem, open the Houses for Sale esp in the CS and go in the menu World --> Interior cell (I hope I remember correctly, I don't have the CS at hand right now). Find the cell of the house in Suran and check the enable water box. The water should appear above the floor. Change the water level to something like -99999, disable water again and save your changes. You should then be able to place your bedroll on the ground without problems.
Notice that a more complete fix for problems like this will be in the next release of MCP, which will get rid of all those water detection problems in cells with no water (making my water level fix mod obsolete
).
2) The bed problem. Probably the bed doesn't have the "Bed Standard" script as every other bed in the game. Since NoM sleep works using this script, the bed you're using won't satisfy it.
For a solution, I'd need the custom script the bed is using, but I can't look at it right now. In a few days I'll go back to my main pc and I'll be able to help. I could also do a compatibility patch for it.
PS. I hope it's nothing too serious.