I can recommend this place. The communication with André was great and we had no problems getting the keys. We stayed here for three days and it had everything we needed. The place was nice, clean, small (as expected) and had a beautiful view over the city and river.
The neighborhood is safe and quiet and not too far from the city (15 minute walk). Beware of the steep streets though, they can be a real hassle to overcome. Uber works great in the city and is recommended for airport transit (even at night time). A one day ticket to public transportation (€6) worked great too for day trips.
The small local restaurant near the apartment is highly recommended as well.