For a first Paris trip, the best neighborhood is not automatically the one closest to the Eiffel Tower. A better approach is to decide what you want to do most, how late you expect to stay out, and how much time you are comfortable spending on the metro.
Start with your itinerary, not the hotel list
If museums and historic sights dominate your plans, central neighborhoods reduce daily travel. If cafés, nightlife and neighborhood atmosphere matter more, areas such as Le Marais or Saint-Germain can feel more rewarding even when they are not beside every landmark.
Three practical areas to compare
Saint-Germain-des-Prés is convenient for central walking and Left Bank atmosphere. Le Marais combines historic streets with food and nightlife. The 7th arrondissement gives easy access to the Eiffel Tower area but can feel quieter in the evening depending on the exact street.
Use metro access as a value signal
A hotel a little farther from a landmark can still be a smarter choice if it sits near a useful metro line. Compare the walking route from the hotel to the nearest station and the number of changes required for your main sights.
Before you book
Check the exact room size, air-conditioning details for warm months, cancellation terms, elevator access if important, and whether taxes or city charges are included in the displayed total.