We are 20 year veterans of Internet services administration and web development, having built one of the first 3,000 websites on the Internet in 1994. We have worked continuously in the field, since, and have used Drupal as a platform since version 4.0 (2005.)
You do not specify whether you are running Drupal 6, 7, or the beta of 8. Are you looking to switch versions, or just upgrade your theme, modules, and functionality?
As you know, the default look of Drupal administration pages and user interfaces are much different and less user friendly than both anonymous and logged-in user pages styled by the theme. In your client overview, it sounds like you are satisfied with the end-user client look-and-feel (based on the Hotel Arghan app in the iOS app store), but are not satisfied with how customers (hotels) are able to update their content.
We would be happy to engage in a consultation to go over your needs, provide an analysis of your current configuration, and brainstorm ides.