I can't even describe how conveniently located this apartment is. It's close to everything. I had no need to use the public transport at all. Staying at the Old town in Stockholm was also a dream come true for me for it's my favourite and most beautiful part of Stockholm (imho). Being able to go any time of the night and day for a walk there was simply unforgettable experience. My recommendation: go for a walk late at night and see how amazingly peaceful the town is.
But wait, there's more... The location is not the only amazing thing about this place. Apartment is very stylish. It even has an old gramophone as well as a fascinating book collection. It's clean, beds are comfortable, it's very well equipped and you will be almost tempted to spend way more time relaxing in it than you planned at first.
I've been in contact with the host, Katia, over messages and she was extremely helpful and thorough with the detailed instructions and quick responses.
All in all, we had an awesome stay and would definitely come again. :-)