I arrived in the middle of summer during a heat wave, and this apartment, being on the top floor (heat rises), does get pretty warm. But Philipp provided a nice fan (the unit is small but is fully equipped with a host of other appliances and amenities).
Also please note that there's no elevator so you have to climb up 4 floors - it's good exercise and I enjoyed it, but it's not suitable for people with health/age/fitness issues or disabilities. Philipp kindly helped me with my luggage, and was a delightful host, sending me little tips on things to see and do in the neighborhood. My time was too short and I wasn't able to take full advantage of all the things to do, but I thoroughly enjoyed my stay.
The neighborhood is really nice, with grocery stores, restaurants, easy access to U-bahn. Feels very safe.