Nicolas was very welcoming (he even invited me and my girlfriend for a beer :) ), great with communication, from the minute I found the listing, I got in touch with him and he got back to me almost straight away. His directions were perfect and the apartment was super easy to find. The location is excellent, only a minute's walk from the metro, there are lots of shops around, restaurants, cheap fast food places, supermarkets and it is within walking distance to the heart of the city center. Only a 10 minute walk from one of the main tourist attractions (Vigeland Park and museum).
The apartment was very cozy, perfect for a person or a couple. The heating was excellent although the temperature in Oslo was around -10 C, we slept without any problems, except for the first night, where unfortunately we weren't provided with a duvet or pillows. We're only humans, problems happen. I realised too late when we got back from the first night and Nicolas was already asleep, so we had to spend the first night only with the couch cushions as pillows and the duvet cover was the duvet. It wasn't too bad, though. Nicolas apologised and he was genuinely sorry.
We were provided with clean sheets, and fresh towels.
The apartment is really a no-brainer if you're visiting Oslo on a budget, great location, clean, new furniture, excellent shower, heated floor in the toilet (although there was a bit of a stale kind of musty smell in it), super quiet, fast WiFi, fridge, oven, cooker, heating. And although the bed is a couch pullout bed, it is more comfortable than a lot of hotel beds I've been. You really can't go wrong with this apartment, don't think twice, just go for it!
Thanks again for a lovely stay and tips Nicolas, we'd definitely stay again with you.
PS: Oslo can be quite expensive, if you're planning on visiting museums get an Oslo Pass, as it covers all the main museums and it provides you with free transportation in the city (Trams, metro, busses).