We've traveled to Paris off-season, in the middle of October. Mostly because of that we had a great check-in and check-out experience with early arrival and late departure without any issues.
Emma provided great and very detailed instructions on how to get to the place, how to get keys and so on.
Place itself is really great: approx 1 min walking to the Basstille metro station (where three lines accessible right away), it is also about 30 mins walk from Cite. If you prefer rented bikes or scooters — they're just around the corner. There're some buses as well but we didn't use them at all.
You can find several shops nearby. Monop (literally, next door), Franprix a few hundred meters away and a lot of smaller stores around. There are a lot of cafes as well.
Place itself has all required amenities: shower, small kitchen, WiFi, TV, iron and ironing board, hairdryer and so on. There is no washing machine, but taking an apartment size into account, it is expected.
Pros: all above + price (at least off-season)
Cons: very lively neighborhood and a bit noisy courtyard. Though Bastille is historically pretty noisy, y'know :-D