Karlin is a wonderful area to stay in. As a young female I felt very safe walking around Karlin at night time with no issues. We stayed for a month and found the apartment very well equipped to daily living, the washer and clothes hanging rack we're super helpful. The Wifi was very good, we were getting about 30mbps download speed which was perfect for doing video calls etc. Katriana was a wonderful host, she even offered to have the place cleaned half way through our visit which was very easy to arrange and they did a super job tidying up and changing out linens. If you are looking for a co-working space nearby we used Work Lounge, which was friendly to foreigners and 24/7 access with very fast wifi. Would definitely recommend to digital nomads or long term stays!