Olga was wonderful to work with and communication with her was excellent -- she travels some, so sometimes it would be a few days before I'd get a response but she was always helpful, polite and a perfect hostess to assist in getting our rental set up with her.
The apartment itself is incredible. It's high enough in the building (with an elevator) so you have views of St Sulpice, Notre Dame, the Pantheon and Sacre Coeur (in the distance) from the terrace and there's a small view of the Eiffel Tower out of the other side of he apartment -- not sure how you could ask for much more. The two bedrooms were great to have -- one with a queen bed, the other with a twin, but the two bathrooms were even better. I took the one with a shower, my wife took the larger one with a bath tub. By American standards, the bath tub, shower and sinks will be small, but for Paris it was a luxury to have so much space. The washing machine in the smaller bathroom was great to have as well since we were there for two weeks, but it's worth noting you need to drip/hang dry your clothes since there isn't a dryer.
We were there in the middle of the summer and the air conditioning worked great and was really a necessity (we're from Texas and no one here can handle a summer without A/C, even when the temps are just in the mid-80's).
The kitchen, dining and living areas were great too -- we can't think of anything negative to say, it was just a perfect place for us.
Madame Santos, the building manager, was wonderful too. She was so sweet and willing to help us with anything we needed.
The area is great too. Rue Cannettes, just a couple of blocks away, had great restaurants and shops -- look for Alfredo Positano, Chez Fernand and Chez Bartolo for meals and Dandy/Divine Parisian to shop. All of Paris has tourists, but Rue Cannettes has a lot of locals that go there for meals too, so it's not "touristy" in a bad sense.
You can walk all over Paris from Olga's apartment and the Metro stop is just a couple of blocks away. There are two groceries stores within a block and you'll find anything else you need nearby too.
I can't say enough good things about our stay here. We loved it and are looking forward to staying there on our next trip to Paris.