Exceptional

Superb

Despite a good try it...

Liked: Stylish dining area in the large glass extension - quietly efficient and welcoming - but the rooms were sterile
Disliked: As above - the rooms were sterile - you can still do minimal without it being sterile -

Incredible.

Liked: We loved the room, it was very spacious and clean. We worked during our stay and the room was well equipped with a desk and good wifi connection. While working away, we try to stick to our routines as at home, and the gym was perfectly equipped to do so. The sauna was spacious and very relaxing. Incredibly helpful and kind staff.
Disliked: The GoogleCast device in our room did not work, unfortunately. Other than that, everything was great.

Exceptional

Liked: Absolutely gorgeous. The sauna is excellent, the restaurant very beautiful and the rooms quite big and very clean.

Great hotel and location.

Liked: Great hotel with amazing location and very friendly and professional staff.

Excellent place to stay! I...

Liked: I loved this hotel! It was super cute, but well sized for a european hotel. The breakfast was delicious and substantial. The bar was convenient and well stocked. Check in and out was easy, especially with the no check out needed portion. It was a bit outside of the city center, but it was within walking distance of two street cars, so transit was really easy.Edited to mention: I forgot to mention the bathroom! It was amazing! Huge, even! I loved it so much, I am using it as a model to renovate my own bathroom at home!!!
Disliked: I can't think of anything I wanted more or above what they already provided.

Would visit again for the...

Liked: Sly is a really lovely hotel, the beds are wonderfully comfortable and the shower was great. Having a drink in the lounge area of the restaurant was nice after a long day of exploring.
Disliked: The breakfast is so over priced we decided to eat out and actually found a delicious little independent cafe around the corner which serves delicious breakfast all day. We found the same with the restaurant menu. It looked good but for Berlin and the area the hotel is in it's all just very overpriced aimed mainly at international guests which doesn't feel too much like the spirt of Berlin so we decided not to eat at the hotel for this reason. The staff are nice but some are much more welcoming than others and when we checked out we said bye to the reception staff who didn't bother to reply so we felt all in all the hotel in it's inception is lovely but it could have a much warmer inviting feeling to it. Side note the gym is also very small, fine for a quick workout but for the size of hotel this could've had more attention placed on it.

The hotel was beautifully designed,...

Liked: The hotel was beautifully designed, exceptionally clean, and very comfortable. The room was spacious with a large shower, and everything felt thoughtfully maintained. The location was also great, conveniently situated right next to the tram.
Disliked: Nothing, it was perfect