Sofia is very nice person! I was late for three hours because of the flight and she was waiting for me! She also told me what to visit in the city.
The flat is great, because it is big enough for me alone ;) it is 1 minute from the river with restaurants and bars and tram 1. The nearest restaurants are closing at 23, so it is not noisy in the evening, but in the morning you can hear them ( but who will sleep , if you need to discover the city?!)
So I really recommend to stay at Sofia's flat