Can't really say. It may be closer to Gambetta than Cimiez (in the area behind the train station on Ave de Thiers). Not really a bad area, not really a nice one though.
The area is probably called Las Planas, near St. Sylvestre. You´ll get an impression where it is if you download a map of the Ligne d´Azur Nice network (1.1 MByte)
I would be surprised if this is not of a good standard. English owned property on the Riviera is almost always well maintained. Las Planas is a pleasant area right on the edge of Nice, about three miles from the sea, with great views in places.
I suggest you check two things. How far is it from the very noisy autoroute? If you don't intend to rent a car, at what time do the buses stop in the evening. Many Nice bus services finish around 6.30/7.00 and taxis are very expensive.
It looks a long way from Nice city centre and very uphill uphill, so walking in to town would be out of the question, or at least walking back would be very hard, especially in the sun, when are you going?
The studio looks very nice indeed and if it is peace and quiet you are after, this would be fine, but do check as suggested re main roads, motorbikes and cars can spoil the tranquility.
If you want to visit Nice city centre, you would need a car, for food shopping too perhaps, so you need to bear in mind which month you are coming to Nice, if in the summer then it will be hateful trying to drive/park in Nice, although fine out of season I would think.
You may be near a bus route but these stop quite early on in the evening, you need to check on lignedazur.com