I arrived Edwin's place on a Saturday and the check-in time is flexible on weekends. I was warmly greeted by Edwin once I arrived and he showed me around in the apartment. Also, he recommended me different places to visit in Stockholm.
Getting to the apartment from the airport was easy. First, I took an airport bus to the city centre (T-centralen) *NOTE- a single ticket is 99SEK if you buy online in advance; 119SEK if you pay on board* Then I took the subway to Karlaplan station, which is 2 stops away from T-centralen. From there, you can walk to his apartment building within 3 minutes. You'll need a key to get access to the building, everything's automatic, safe and convenient! Also, the building is located above a shopping mall. You'll find 2 supermarkets, some restaurants and shops there.
As for the apartment itself, it was extremely clean and neat. It really felt like home and I enjoyed my stay at Edwin's place. Thank you so much!