I'd see the biggest possible issue being the car's immobiliser losing its memory, and failing to recognise the key.
Unless you've got a battery drain somewhere, a car shouldn't suffer any ill-effects from sitting for 5 days, and only being used on weekends. We've had weekend 'fun cars' in the past that sat quite happily in our garage for 2-3 weeks without use.
I'm assuming the car will be garaged, if so then make sure you crack the windows open, else condensation and mustiness might be an issue. Also, a well-ventilated garage is better than one which is virtually airtight.
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