On the train, I climbed up my berth, listened to my mp3-player, read, and watched the guy who tried to put a parcel under the lower seat. It was obvious that it would never fit underneath it but he kicked it anyway. After a minute or so, I recommended to flip it onto the side, which was much narrower. And surprise, it fit! Well, this is no peculiarity. After all, we are in India, where such things happen all the time.
15min before arrival, I started to chat with a young Indian couple from Mumbai who returned from their holidays in Goa. They told me that they get ripped-off by Indians as well! I was somehow relieved that they don't think that only Westerners are boneheaded...
With only 5min delay, the train pulled into Victoria Station. When I got out of the train station, warm air (comparable to lovely summer nights in Europe) welcomed me and I felt quite good about Mumbai.
I checked into a hotel just across the street. The cheapest room costed 700Rs, about 2.5 times the average I payed so far. When I saw the room, I was quite surprised: it had a shared toilet and a shared bucket shower. The room was as long as the bed and wide enough to be able to open the door. But my cabin had A/C and TV!