We used taxis a bit last fall, we found the G7 Taxi app handy. Can pre-book cabs, summon them, get an idea of fares, pay the fare if you want. Kinda Uber-like but for the big taxi company. Other than that, we just bought transit multi-day passes. Very easy to get around.
Carrying luggage on an RER shouldn't be a big deal unless it is rush hour, I used to do it in my backpacking days.
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