The stay is amazing.
The apartment is in a seaside complex, which has all restaurants, grocery stores (European or Asia) nearby. Apartment is clean, tidy and stylish. It has every facilities you need (kitchenware, fridge/freezer, dishwasher, washing machine...). The apartment has its own private parking permit (but we dont use as do not travel by car)
Landlord is very helpful, giving us detail instruction. Check in / check out is super easy (even for late check in like on our case)
The neighborhood is quiet, safe and friendly. Two tram/bus stations are nearby around 400m (one has metro) so you could easily go to anywhere you like. When we are in Helsinli, mostly we catch the tram 5 (to Viking line), 6, 7(to centre), 4 (museum). Or walk 25' to the centre, your choice.
All in all, this is one of our most satisfactory stay during our 1month European travel. And its price is reasonable compared to how expensive it is in those Nordic countries.