Mary's place is in a really good location, really easy to find and close to public transport. Although it's in the middle of the city, I didn't find the noises too distracting.
Mary is always fast with responses and has a really clear and helpful user manual.
We had 5 people and we fit in there quite comfortably. It was really clean and had a good amount of amenities.
It's on the rooftop of a building with no direct lift access, so do be careful if you have a lot of luggage because you will need to climb one flight of stairs.