Despite its location in the heart of the Strip District, the Guardian Self Storage here actually has ample (and free!) parking. The office staff are friendly and extremely helpful / courteous whenever you have any questions or problems. I never had a storage unit before and wasn't sure what I was getting into, but they walked me through all of the details and explained line by line what I was paying for. I especially like the indoor loading docks and heated / air conditioned hallways. Moving your stuff is always so hard - they at least attempt to make is somewhat easier.
In addition to the storage unit, you have access to a truck that you can use whenever it's available. They say it's 'free', but it actually will cost about $21 for insurance or something (plus the cost of gas) to use. My only criticism is that you can't take it for more than something like 20 miles round trip which posed as a problem for me considering that I had a bunch of stuff at my parents which is further than that. That would be my only caveat about Guardian. Otherwise, the storage facilities are excellent.