First the loft in Kallio is just perfect, you will find every equipment you wish for, plus some you will not have time to use (I bet you are here to visit). It is nice to have access to personnal stuff ( wire and computers'cables for my part) so you experience more than in boring standardised hotels.
Then the location is ideal, bus, tramway, shop stores, pubs and a thai restaurant at a very close range. If you are a walker, you can even skip the tramway as I did. You need 30min to reach the city center and 45 for the harbour.
I was welcomed by the sweet and funny Ana as if we were old friend and that was just great and inexpected. So good to have someone explaining you and showing you the surroundings when you just arrive from the plane and get tired. We went for some pizza afterwards, and talked a bit about our lifes !
She is a polyglot and she made me practice my dusty spanish haha.
Considering the interesting price, it is really a place I will go again if I come back to Helsinki !