Hi,

My friend's dishwasher doesn't smell so good. What's a good way to
get rid of the smell.

Depends on why it is smelling. This a new problem, happening a while?
Built in model, postable model, any plumbing changes lately?

http://www.repairclinic.com/referral.asp?R=153&N=893478

DishwasherMagic: Specifically designed to clean dishwashers of lime
scale, iron and soap scum buildup, safely and effectively.

http://www.repairclinic.com/referral.asp?R=153&N=821

Glisten Dishwasher Cleaner and Deodorizer - Get your dishwasher
sparkling clean and lemon fresh. Removes built-up soap scum and
discoloration due to iron and other water impurities. Also works great
in washing machines, porcelain sinks and porcelain tubs. 3 ounce
packet.

These may help.

It also always has some water in the bottom. Is that ok?

Many dishwashers will have water visable in the bottom.

It's a
Nautilous model I think, but I keep forgetting the make. I can get
the make if it is important.

Some model# helps....
http://www.applianceaid.com/model.html
jeff.
Appliance Repair Aid
http://www.applianceaid.com/