Max's place is as good as it looks, and it's extremely convenient. I don't think you can get much closer to the Republique Metro stop. I would stay here again in a heartbeat. Though we didn't meet in person, Max himself is very friendly and easily reachable over messages.
The apartment is clean and actually bigger than I thought it would be. I'm 6'0, and I could sleep on the couch, which is always a bit of a concern. The bed is also comfortable, as others have already commented. We were three people for 10 days, and the apartment never felt too crowded.
As a sometimes-digital nomad, I actually had to work remotely for a week, and the WiFi was strong enough for me to make video calls. He has a desk or dining table you can do work from. If you're looking to do the same, this apartment is good enough.
For people who have medium/long stays and want to use the washer, it's a bit slow (but in my experience, small European washers are like that). There is no drying, but the bathroom has plenty of hanging racks, and the apartment has some heaters that you can lay socks on. Just make sure to wash your clothes two days before you're going to wear them or leave.
Max uses a company Luckey Homes to manage check-in. He makes this clear, so make sure those times work for you. It's a little less flexible than a regular hotel, so that's a small hassle. We took the train the wrong direction and were quite late to meet the Luckey Homes representative, which wasn't a great experience for anyone.