Moscow is not just expensive, it is also pretty great. A lot of people told me that a few days in Moscow would probably be enough, and they were right, but I had a pretty good few days. Since I left Albania this is the longest that I have been in any one place (except Denver and that doesn't really count). I don't actually like the hit and run approach to travel that I did in the early summer, but because of time constraints it was what it was. Even though I usually felt rushed, I knew it could be worse- we were constantly seeing tour groups on crazy fast super tours- follow the group, stay in line, ok next country! While I appreciate the ease and convenience of tours like that, I don't really think they are generally right for me- even if I could afford them. Anyway, so having five days in one place was kind of a treat. You get some time to get used to things, to back to things and not feel rushed.
The jet-lag hit me hard the first day and I opted for taking it a bit easy- I walked around town a bit and when it started to rain, I headed back to my hostel and took a nap. There would be time enough. On the second day I hooked up with an Aussia from my hostel and we went and saw the jewels of the empire at the Kremlin. The next day we went up to the university on the hill above the city for a great view and spent the one once day I had in Moscow walking all around the city.
Probably my favorite thing that I did the whole time I was there (and the cheapest) was tour the metro. The Moscow metro was built in the 1930s at the height of Stalinist Russia. He made the Metro stations "peoples palaces" and filled them with marble, statues, mosaics and frescos. I spent about 6 hours going around the four oldest (and most ornate) lines. It was the perfect way to spend a rainy day- warm under the streets. 
