...I've asked some questions about hotels in Paris and I have gotten several answers that say to stay in the center of Paris. Where is that? Is this hotel close to the center of Paris? Paris Marriott Rive Gauche Hotel & Conference Center - 17 , Boulevard Saint Jacques. Or is this one better - Renaissance Paris Arc de Triomphe Hotel - 39 Avenue de Wagram. We want to visit the tourist attractions and need to stay at a Marriott or a Renaissance hotel. Where should we stay? I know we can take the Metro from any location, but it would be nice to be close so we can go back to the hotel and rest during the day.

"The centre of Paris is deemed by the authorities to be the square facing the main entrance of Notre Dame cathedral. Anywhere with a radius of 2 kilometres can be considered Central Paris.

The Paris Marriott Rive Gauche Hotel & Conference Center - 17, Boulevard Saint Jacques. is a lot further out than your original suggestion being situated to the south of the river near the Perphérique and a major rail terminal - can be noisy as that road never sleeps, neither does the rail terminal. Only a cemetary separates the hotel from the rail terminal."
(chosen answer)