Like any home, your river condo should be clean and staged appropriately for the sale. Make sure any architectural features that are desirable are featured prominently. Riverfront condos, especially high-rise condos have a visual/view element that can be played upon heavily.
Make sure your balcony is free of clutter and is organized. Ask you real estate agent for advice on other ways to improve how your condo is organized. Sometimes the little things make a big impact on potential buyers. Having someone else look around can give you an idea of how your buyer may see the condo.
In Closing
When your agent offers you any advice, remember they have your best interest in mind. It's their job to help you get the most out of the sale at closing. Hubert Miles