Fine, but some drawbacks
There was a small issue when we checked in, because the keys were put in another place than said. But the host replied very quickly and kindly so everything went well!
The location of the flat is fine (5 minutes to EU sights, 25 minutes to city center by foot), restaurants and bars nearby.
The size of the flat is suitable for 2 persons. What bothered us was the partially missing cleanness (dirty dishes in the kitchen and dirt in the cabinets, probably from the previous tenants) and the misleading advertised interior. We were looking for a fully equipped kitchen (main reason why we chose this apartment) to find that there were many additional devices (like sandwich maker, hand blender) but most basic elements like forks, knives, spoons were missing and we had to buy them at a dear price. Warm water was limited also after activating the boiler, so taking a shower was a bit challenging as well.
Besides that we recommend the host + apartment.