I'm assuming your husband got C-21s?
Furniture:
My wife and I had the same question, buy US and ship or wait till we got here. I was hesitant on the Euro furniture, but I absolutely love the leather couch I got. It's really up to you. Check out IKEA or https://www.lederland-kaiserslautern.de/ that'll give you some ideas on what to expect here.
Bikes:
Bring them. One word - Autofrei! In the summer the Germans will shut down scenic roads for a day and only allow bike/rollerblade/skateboard/walking/ect on the road. I'm talking lots of road, 50+ Km. Along the way, each town/villiage will have food and entertainment. They are ton's of fun. Besides that, there are so many places to ride bikes here. Very worthwhile.
Electronics:
You can bring 110v stuff from the states, you will need to use transformers though. FMO will supply two large ones for you, and people PCS'ing are always selling them. My wife didn't bring a good majority of her hair styling related stuff, and it kind of sucked having to buy all that again. Also, if you have good kitchen appliances (mixers, ect) bring those as well. When we cook, we just plug what we are using into the transformer. One transformer is much cheaper than a ton of new stuff.
The only major things I have that are 220v are the shop vac I use (we have all wood floors) and lights. Basically things that don't make sense to have multiple transformers for.
Send me a PM and we can start helping you guys out.