It was a good, semi-comfortable stay. It does provide you with amenities to sleep, cook, and work, however, I'd name it basic for the high (enough) price it's costing. Even though there is one big (but noisy) fan for the whole 3 bedrooms, you really feel the lack of AC in June - it's very humid and hot to stay in. It might be good for autumn/winter, but summer in this apartment is challenging. It is indeed a 5th-floor apartment as described, with no elevator, so keep that "daily climbing" in mind. (It's doable, but on a daily basis, might get tiring).
On a good note, the location is awesome - you're right at the metro line, the beach is maybe 10 min away, and a huge mall is 7 min away. You're still not too far from the city but far enough to get some peace and quiet. The neighborhood feels safe even at night. The communication with the host was good, too.
I'd say if you feel the price is fair, it's a good place for colder months when you don't need the AC. 2 bathrooms are very convenient to have, the washing machine is great, huge fridge too, and beds are comfortable. But it is very basic and cleaning upon check-in is not up to proper Airbnb standards, I'll say. Overall, I'd say a strong 7/10.