Beautiful apartment. Great location - just make sure you use your smartphone to navigate to save you step as you venture out; otherwise, you'll be walking extra steep hills.
Beds were comfortable queen-size beds. . We didn't use the couch in the living room so I can't comment on that. Kitchen is functional. There was 4 of us and it got a bit crowded with all 4 of us in the kitchen but not uncomfortable. There was a small table in the kitchen but only 2 can use it concurrently - you'll need to go to the integrated living room/dining room to sit 4 to 6 people to eat. The apartment does have a good size, nice living room/dining room very comfortable for 4 people and I would suspect 6 as well. If you need to wash clothes, be aware that the washer doubles as a dryer - not usually what's available in the US but it's good for small loads.
My wife and I stayed in the smaller bedroom with the twin beds and slept very comfortable. Plenty of closet space for travelers. There are dehumidifiers in the 2 bedrooms that you will need to empty every day - quite a bit of humidity for late October which is when we visited. There are individual AC units in the bedrooms and the living/dinning room - you can set your own temperature and fan speed. Bathrooms are functional and comfortable. They are far apart from each other so you won't be able to hear people in the other room snoring.