My boyfriend and I stayed at the Marais Studio for a full week. It was my boyfriend's first time in Paris and my first time back as an adult. Emma was fantastic - very easy to communicate with and very flexible (we landed at ORLY around 9pm and she made it very easy to meet up with her around 10pm.) She even helped us right away finding a market open to buy a bottle of wine and while we went out she dropped off extra toilet paper after I realized we were down to the last roll. We didn't have to reach out to her after the first night because after a short time exploring it was very easy to find everything we needed nearby :)

The location of this apartment is absolutely perfect. Cafes, restaurants, bakeries, markets, wine and cheese shops, banks, bars were all within a block or 2, and 3 different metro lines were easy walks away. The studio itself looks out onto a little courtyard so though the neighborhood was lively the sound did not bother us at night.

The apartment itself is as described - it is little and not glamorous. The bed is very comfortable (best futon I have ever slept on.) I appreciated that there was a drying rack in the room as we were able to do laundry in the sink and leave everything to dry in the room. I recommend you make use of the provided wardrobe to stay organized as 2 opened suitcases would quickly take over the whole space. Temperature was comfortable, but the weather was ideal so I cannot speak to it getting too hot or too cold. The landline for free calls was a great bonus! Wifi was good - we streamed netflix with no issues and uploading photos to facebook, etc, was so problem.

Couple notes:
We ran out of hot water when my boyfriend showered after me. We remedied this by staggering our showers (evening/morning) and didn't run into the problem again, but that one morning was quite cold :)
They are doing construction on the neighboring building and start at 8am. My boyfriend described it as "rocks in a metal bin being shaken" so it's a bit loud, but it really didn't bother me when I had in earplugs, and the windows closed really minimize it.
4 flights up which wasn't an issue for us, and the spiral staircases were really charming!

If you are looking for a big comfortable updated room to hang out in in Paris, this is not it. If you want a terrific deal in a fantastic location that is clean, safe, with a comfy bed and the basics, this is perfect! We had an amazing time in Paris, and every day as we staggered back from a long day as tourists, we couldn't help but comment on how perfect our location was.