Aloha Micael,
Yes you're correct, there are not many place to stay in Lahaina town. There is the Plantation Inn, which is small and quaint, and unfortunately a little run down. There is also the Pioneer which is largely the same situation.
Probably your best bet is the Outrigger Aina Nalu
http://myhawaiivacationpackage.com/maui-hotels/aina-nalu-resort.html which has recently been renovated. It has studios, one and two bedroom condos and is only a couple blocks off of Front Street in Lahaina.
They've been running some pretty good specials since reopening after renovation.
