Now I am not one to disparage Walmart like so many others do. It has it's place in our economy and their success should be applauded in this day of failing business. They serve a particular niche - bargain prices on utilitarian items. I don't shop at Walmart for designer clothing, high-end electronics or gourmet food. But when I want to stuff the larder at home or pick-up some casual clothing, there's no better deal out there than Walmart.
The Casa 400 hotel serves the same purpose for me when I visit Amsterdam. It's not trendy, it's not pretty and it isn't exactly in the middle of the action, but for a reasonable price you get a clean comfortable room located just a few meters from the subway. On previous visits I wasn't always impressed by the seemingly disinterested staff, but on my most recent stay I found a much more positive attitude at both the front desk and the breakfast room. The bar was very accomodating toward our large group also.
The rooms themselves are a bit spartan, but as long as there were clean sheets, a functioning TV and clean bathroom, what more does one need? You're in freakin' Amsterdam. Party Central. The hotel serves as a nice place to bed down and clean-up. Rooms were quiet, comfortable for European standards (meaning big enough to turn around in but a little cramped if you wish to lay out your suitcase) and reasonably priced. Even if I weren't in a tour group I would consider booking this hotel when traveling alone.