House as it was right on the metro and loads cheaper than the Champs Elysses/Eiffel Tower areas.   It was nice and quiet too and in the center of town.    The Paris metro is fabulous and very easy to use.  The lists everyone have given you are great.   Also we enjoyed a day out at Versailles.  We actually thought the gardens were more interesting than the inside.   Oh  also  the Sacre Coeur at night really is fabulous.  The view cannot be beat.   We got lost trying to find it however.