Here are some recommendations for your stay!

Töölö Tower –  Economy apartments and rooms including breakfast starting from 71 e single room  /night.
Book here  Töölö Towers – Unihome – use the code UNI21 and receive -10 % discount.
Public transport between Töölö Tower and Aalto campus: Bus from Töölö to Kamppi + metro to Aalto University, approx. 30-40 min.

Campus hotel – if you wish to be adjacent to the Aalto campus, where the doctoral education and Transatlantic Infraday will take place,  a nice option is Radisson Blu Hotel Espoo– they offer good rates around 100 e/double room /night.

City centre hotel
If you prefer living in the city center but close to the metro (Kamppi > Aalto campus 15 minutes) we recommend Radisson Blu Royal – also reasonable prices around 125  e /double room / night.

Good  Airbnb homes are available in Helsink and Espoo.