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You can't get much in them, and with a top speed of 28 the amusement might fade quickly.
That wouldn't be a problem, the usual ~5 mile route we take has a single 200m section of 30mph limit (the top of Putney Hill and round Tibbet's Corner), the rest is all 20mph.
The main problem with all of the rental/Zipcar options is that it's a 15 minute journey, 2.5 hours of not needing the car, then a 15 minute journey back. So it's a choice of paying for more expensive one-way options or paying for the dead time when the car is doing nothing. Uber isn't cheap at these times either (~5.45pm and ~8.15pm)
You can't get much in them, and with a top speed of 28 the amusement might fade quickly.
In france you can drive them without a driving licence.