Location is key when you are a tourist in a new place. Géraldine's place is centrally located, close to metro (Châtelet RER), a brisk walk from the Seine river (take Rue des Bourdonnais to catch a boat ride at Pont Neuf).
If you are bored you have plenty to shop for on Rue de Rivoli and Forum Shopping Mall which is right next her place. Louvre, Jardins des Tuileries & Notre Dame Cathédrale is again within walking distance. On the Pont Neuf bridge you can catch 3-4 different hop-on hop-off buses which takes you across the city. We prefer L'Open Tour (yellow bus) since it has the best coverage across the city. You feel free to pick yours.
As for the place, it's cozy, bed is comfortable, spacious enough for two people, there's place to keep your clothes and even a washing machine if you feel like using it ;D , kitchen has all that you will need, shower though is a bit small but serves the purpose, and the apartment is private and very quiet. The place is accessible round the clock and is absolutely secure. Well the thing in Paris is which arrondissements municipaux, (administrative districts) you are staying. Her's is in 1, and Marais (4) and Latin Quarter is a short walk and you will love the ambience there. Not all locations are safe.
Inside her apartment you will find some city maps and Paris guides. As a host, Géraldine will personally meet and explain the house rules and if you need she is mostly available over WhatsApp to answer your queries and provide you with good tips for the city.
Once again, location is the key. Oh before I sign off, there's a supermarket Franprix on Rue Bertin Poirée barely 5 mins walk from her place, where you will find all that you need to eat. Have fun, walk around, safe travel. All the best.