Marc has an apartment with a fantastic location. There's a big park just 5-10 minutes away and many restaurants and shops nearby. The apartment and my room were nice and clean, but the radiator didn't work so it was very cold in the room. You also don't get a separate key for your room (Marc will frequently enter the room to close the window or to tidy it whilst you're not there). There is just a microwave, but no proper kitchen in the apartment. If you stay there for just a few days it's perfectly fine, but in my case, I stayed there for 1 month, so it got pretty expensive to buy dinner every day (but Marc told me that in advance).
If you have any questions you can always ask Marc and he will try his best to help you. He also responds very quickly, if you write him a message.
Marc is tidy but very pedantic about mess and conservative with water usage and electricity, which can be an issue if you're not extremely quick in the shower.
After 1 month I didn't really feel comfortable in the apartment- I'm sure Marc's apartment is a nice place to stay for a short period, but would not recommend it for longer durations.