Erin's place was great. It's small, but for 2 people it's great and if you wanna be in Le Marais, the location is perfect.
Beds: If you're a bit older or scared of heights climbing the stairs might not be for you. The bed up there is lovely though and very spacious. The sofa is good to sleep on in a pinch, but I wouldn't recommend it for every night if you're fussy about hard beds.
Amenities: the kitchen has everything you need, including complementary nespresso. Enough towels and pillows and blankets and everything was spotless.
Location: you're in the middel of Le Marais, so if you want to have a quick trip to Paris where you can shop, see a few museums and grab nice food it's perfect. It is the more touristy (and therefore pricey) part of Paris.
Communication: Erin was great, she sent us the code on how to get into the flat few days before and every time we had a question (we had some trouble figuring out how to work the heating and the code on the door) she answered straight away!