Yeah, scratch my first post because I had this mistaken for that Sim Tower game. I recall hearing that it is slated for a DS remake, but this is not it.
The funny thing about this game is that it's closer to Sim type games than any produced by Maxis on the DS to date. You're managing a hotel that is populated by uncontrollable NPCs, and your job is to maintain and improve facilities to accomodate them and keep them satisfied. You'll choose where to install rooms, then can make various improvements to the rooms by upgrading the furnishings or adding new ones. You can also invest money into improving aspects of the hotel like entertainment or dining quality, similar to Sim City with budgeting money toward issues like environment.
I have only played the first few days so far, but I know somebody is going to enjoy this game so definitely check it out if you enjoy simulation genre games, and particularly if you were disappointed with the Sims offerings so far.