The great stuff: the host is super friendly and helpful; the flat is clean, well-stocked, stylish, tasteful, well furnished, and spacious. The location is close to food, shops, metro, and a very nice park all with 20 minutes on foot. Plenty of pillows to choose from and comfy chairs and a couch for lounging during off hours. The host was super helpful when we ran into an issue with wifi and took a lot of time out of her day to help us.
But the flat is on the ground floor and has tinted windows (great for privacy during the day but not for letting in natural light). If you don't mind a dimmer setting, you'll be fine, but if you crave natural light it can be a bit sparse.
Ground floor also means being closer to the endless noise of the city. Heavier sleepers will be fine, but if you are more noise-sensitive, you may need to put up with the racket of motor scooters flying by day and night (and the oldest clunkiest garbage truck ever drives down the road every night). The entry door that other residents use also is pretty dang noisy and often woke us up when people went in or out.
Otherwise, a great flat and an all-star host!