See Stornoway for accommodation there. More rural places are listed here.
self catering
Renting a house for a week or more is a popular option. Such places are generally let from Saturday to Saturday. Some of these can be found on the tourist board website (http://www.visithebrides.com).
bed and breakfasts
Some can be found on the tourist board website (http://www.visithebrides.com), but many are no longer listed due to the charges and "hassle".
Newly opened, the finest place to stay in the Hebrides is just 10 minutes to the north of Stornoway - Broad Bay House (http://www.broadbayhouse.co.uk) is the islands only 5* serviced accommodation, and has a superb beachside location and award winning dining. Broad Bay House is currently rated as the top rated B&B / guest house in the whole of the Hebrides on Tripadvisor, and has set new standards for guest accommodation in the Western Isles.