I think I might be able to help here. How about placing chairs and small tables up the wall. Make people walk around in there, and make small bookshelves line some of the walls. You could also make a back room for the innkeeper to sleep in, a toilet. Alright. Check the attached pics. Start with the floor, the roof, the counter, all the importent stuff. Then put items on the tables (books, magazines, glasses). Put a piano with a butler playing it, and the background music should be something that sounds like a slow piano song (if you want to have background music). You could also have the bmusic to be that of people talking. Anyways, you should have all kinds of things that makes it more interesting, while only things that will fit in. Attached is (part) of an example. Putting in a fire place and the lowerst fire there is (on the list of graphics), and choosing "Move Animation". Either you place someone in front of it or you choose "Lock Facing" as well. Make a lot of people! Make them have varied and interesting messages, that will catch the player's mind right away. Instead of just "Hi" make them say at least things like "Oh, hello. Who are you? A hero?? As if!! You don't look like much hero-material to me, you don't!! Ha!". Give them personalities, just like you would with the important characters. That way, a 20x15 map, can be a big place!
Hope it was helpful. Sry for no pics, but sth went wrong with the saving of them...