We had a very nice stay in this apartment - in particular, it's incredibly central and gives good access to the city and all of the landmarks. The studio is cozy and generally has all the required amenities.
The main drawback is the lighting, as others have mentioned. The studio is basically windowless, except for one opening into an "exterior" space that doesn't really get any sunlight; it is easy to feel as though it's always night time inside. The kitchen area is also very small, we had to remove the chairs just to be able to open the fridge and move around.
Despite these small issues, we were happy with our stay and would return to this studio for the convenience it provided, its cleanliness, and our flawless communication with our hosts.