The location was great, would truly recommend staying at Grünerløkka.
The only difficulty was the communication with the host - I asked repeatedly about the check in process and he did not give out any information until the exact check in time (3pm). That was a little complicated because I did not have wifi on my phone and was running from one coffee shop to another to check my inbox - and again, I did not get a message.
After asking once again I received the pre - written message which would have been nice to have a little earlier. There were instructions on how to get into the city, which bus / tram to take etc. I have had figured it out by then…
Besides the complicated check in, everything went smoothly.