This flat is truly lovely and the location is fantastic. While I had been to Stockholm many times before, I was hosting some friends on their first trip there and wanted to "wow" them a bit -- and this flat definitely delivered! It was a perfect blend of the beautiful old city and history of Stockholm with all the modern conveniences you want, and it's literally right in the middle of everything. Stockholm is such a walkable city in any case, but the central location of this flat makes it very easy to walk pretty much anywhere. Of course, the T-bana is just up and over the hill if you need it, so it's very well-located.
It's also remarkably quiet inside the flat which, given the location, was a nice treat. The street itself is quiet and the bedroom window looks onto the courtyard, so you can really get a good night's sleep. The flat is nice and bright so I would recommend bringing an eye mask for sleeping if you go in summer to help with blocking the light. There are good, heavy shades in the bedroom and living room, but hoo boy the sun comes up early in summer so just a little tip if you are at all sensitive to the light, like I am.
Katia was a wonderful host and communicating with her was easy and timely. She was helpful in arranging an alternate check-in for my friend, who was scheduled to arrive several hours before me. This turned out to be extra helpful as my flight was delayed and I didn't arrive in Stockholm until the next day. My friend was traveling alone and was a bit nervous about being on her own, so I was very grateful that she had a place to stay and didn't have to go looking for a hotel.
The flat was clean and all set up for us when we arrived, which was much appreciated after a long and tiring journey. My only recommendation would be to have some capsules for the Nespresso machine available (or information for where to purchase them nearby) as we were unable to make coffee on our first morning. Of course, there are loads of lovely cafes nearby so it wasn't a tragedy LOL, but we would have loved a cup of coffee to get us going while we were getting ready to go out.
Overall, I can't recommend this flat enough. It is so incredibly charming and I feel like it really provides a true "Stockholm experience." I would 100% go back to this flat again, if Katia would have me. Stockholm is one of my favorite places on the planet, so I do intend to return many times.
I hope you find this review helpful, and enjoy your stay in this wonderful city!