Our entire apartment with a big living room and a large bedroom, nice dining room/kitchen and a big bathroom - right next to the sea with view to Suomenlinna sea fortress. Helsinki's main attractions are within 15 mins walk or a short tram hop away.
The neighborhood of Katajanokka is very peacefull as there is no through traffic. There is a nice seaside park right across the street and grocery store Alepa is nearby.
Tram 4 has a stop one block away at Merisotilaantori and it runs very frequently until 1:30 am or so. Market square, presidential palace, Helsinki Cathedral (White Church), Uspenski Cathedral, Esplana…