Doing some research of the Internet. You can go to a local travel agency and book on the spot. However, you risk to pay higher fees as you have no change to compare the prices. Nowday, you can easily compare prices on the Internet. If you are comfortable with the prices, moreover confirm the booking online. Using the Internet, you can check if rooms are available, and compare prices at the same time. To get better review, call the hotels you like directly to get an idea of the customer service available and to determine room facilities and availability. Make sure you read as many reviews as possible.
For example of search result of apartment rental in Paris, you can simply visit the link " apartment in Paris" below