I'm no plumber...but we recently had the gurgling followed by backup in the tub (lowest plumbing point)...and it was caused by a blockage to the main sewer line. (In my previous home, we had a basement and an annual blockage in the main sewer line that would manifest itself as a backup in the floor drains of the basement. I don't think they build them like that anymore. Ew.) Is the smell the sewery smell or the musty smell? Not that I can diagnose from that, but it might help the plumber. Musty would make me look for a leak or past spill, but a leak wouldn't have anything to do with your clog. I think that if the DD had the clog, you'd ONLY have a problem with the DD, and it would be horribly obvious. It must be bigger than that. Do check the plumbing forum. They're usually active enough over there.

I would say you are off to a great start with the leg planter and window coffee table! What more could a guy want? all kidding aside the exterior cladding should have little to no bearing on your decor. The architecture and style of a home should come into play when doing additions and remodels where permanent elements are being chosen, such as flooring, trim, and cabinetry. Also "shingles" here is your siding, not your architecture. There is a style of home called "shingle style," and this ain't it.

Take a few pictures of the ENTIRE space. Several angles........ My bet is the garden projects need to move to the nature outdoors.

In addition to the bed you need a wardrobe for hanging clothes. Some have drawers and shelves inside, but others have more room to hang longer coats, dresses, etc. Take a look at these IKEA wardrobes. If most of your clothes can be folded you might also prefer a chest of drawers. Just make sure any furniture you buy will fit in the space available. It can be helpful to take a tape measure with you when shopping. If you wish to use the other side of the bedroom as a social area, consider using a chest of drawers or other furniture as a room divider. Set a TV on top of the furniture and a couch opposite that. There's just not a lot of room, so look for furniture with narrow arms. European furniture tends to be smaller because living space is smaller. Also consider having another social space in the room with the kitchen. It can be around the kitchen table, but there might also be space for a couple of comfortable chairs and a side table.