We stayed at Claudi's for about a month. The location is great, its across the street from a market and a metro. Getting around was super easy. The apartment itself is nice but we did have a few problems. The most notable is the hot water. We eventually realized that the hot water would only stay on in the shower if you also had the sink running at the same time. It's odd but it worked for us. The sink did shut off a couple times but for the most part it stayed on. Also, the cooking ware is pretty old. The knives were especially dull, and one of the pots would leak. If you're booking this place for 3 people like we did, the pull out bed is so uncomfortable, its like sleeping on springs. We ended up buying a mattress pad and leaving it there. Claudi said she would reimburse us so that's appreciated. The rug was a bit old and dirty, and the pillows were super flat but those can both be easily replaced.
Guests should also know that in order to use the gym you have to make a reservation through Claudi at least a day in advance, and the laundry machines use special laundry coins that you can only obtain by transferring money to the building (again through Claudi). Also, if you're planning on renting bikes like we did, you can not use the elevator and have to carry them up and down 6-flights of stairs.
Management is adamant on not allowing large objects into the elevator. I think there is a storage place for normal bikes but we had to charge our E-bikes and there were no outlets out there.
The building itself is super safe. There's staff 24/7 monitoring the entrance. Additionally, if you stay for a long period, you get free cleaning once in a while! Overall, its a good stay but the apartment needs a bit of attention before its a 5 star stay.