Reasonable accessible, but improvements are required
This review is especially helpful for those who have or use the following: Powerchair
It's a great museum, but it can be hard sometimes to get everywhere and certainly when you are on your own. I actually got stuck somewhere on the top floor in the museum, because the doors were to heavy to handle by myself. There wasn't any staff available that moment over there, but I had the luck that there came another museum visitor, who helped me with the doors. Disabled toilet which I used was too small, badly accessible and didn't have a bin. The food in the restaurant was lovely and the staff was very helpfull over there.
Transport & Parking
I arrived by bus and it wasn't clear how to get there, but my iPhone helped me out. Busses are accessible, but the underground needs improvements.
There are quite a few very heavy to open doors. Do not go to an area where you don't see other people when you visit this beautiful museum on your own. There are in most places communication devices or phones on the wall, in case you might need assistance.
Disabled toilet was hard to find, signs weren't totally clear. The bathroom was too small, there wasn't a bin and needed more work doing as TLC.
Staff in general like to help you anywhere without any problem.