We brought a Groupon with this company and loved that we could decide when to use it last minute. No pre-booking. The bikes were in great condition. They provided helmets for those who wanted them (anyone under 18 has to have one).
Our family of four had the most fun day while in DC just cruising around the monuments, over to Arlington and the Iwo Jima Monument. We biked from 10am to 6pm. The day was so much fun. There were places to leave the bike everywhere. I recommend to use the bikes to visit the monuments to get the most value from the rental. If visiting the museums I would just walk as you spend a LOT of time in the museums and they are closer together.
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