We were very happy with our stay at Caroline's apartment and can recommend it highly. It is fairly small (as Parisian apartments tend to be) but more than adequate for a couple or a small family, very well equipped and beautifully furnished, everything seems quite new and very clean.
The apartment is on the 8th floor, there is a lift up to the 7th so the stairs are very manageable. There is a lovely little balcony from which you can indeed see the top of the Eiffel Tower as well as Invalides.
Inspite of the central location there is no noise from the road as the complex is a little set back.
The neighbourhood is pleasant, safe and not too touristic with dozens of restaurants, excellent boulangeries and a well-stocked supermarket within easy walking distance.
The nearest Metro is less than five minutes walk and two other stations are very close as well, you can even walk to many interesting places.
Caroline was very accommodating to us and we would certainly choose her place again.