We would like to take the metro into the city, stay for a few days, rent a car( near a T station) and then on the return to Boston, take the Metro back to Logan. I am finding it daunting to match areas and rental car companies. The airport rentals are exorbitant(Sp?) and parking is probably a bear. I do not want to stay too far out of the city with a long Metro ride in and out( two teens in tow) but the hotels are pricey inside the City. Which might be the closest T ouside of Boston proper with rental car agencies nearby? Thanks.