Horrible experience.
1 - Before booking it, I made it clear to Silvia I'm a remote worker and rely on the internet, specially for video conferences, and only booked it after being told its speed was 10Mb, reasonable enough.
As it turns out, during our self-checkin, the first thing we noticed was the wifi was open, there was no need for a password, and using a network traffic analyzer we confirmed it was being used by at least another 4 devices. After pointing this out to Silva, she asked me to password protect it, which I gladly did.
By mistake though, I put a slightly different password than asked. Only then, and by force of this mistake, Silvia admitted she intentionally shares the internet with other neighbouring flats.
After some uncomfortable arguing on why this is unacceptable for work, she increased the internet to 35Mb. Of course being it still shared, it was never really stable and I had to use my personal LTE data for most of my meetings.
2 - On this day, she sent her assistant to our apartment to discuss it, despite I telling her I was about to have a video conference.
Sure enough, her assistant arrived exactly during an important part of the meeting and I was not able to attend her.
Now, her assistant ringed and knocked on the door AT LEAST 10 TIMES, (which eventually didn't go unnoticed on the meeting) before giving up. Embarrassing.
3 - On another occasion, I was having a romantic dinner with my girlfriend, and noticed I was being contacted multiple times by Silva (I keep my phone on mute).
Our neighbours complained they were not able to use the internet. We came back home and verified, it was working fine.
Having the router in our apartment made us somehow responsible for the internet. Very inconvenient.
All that said, the location is very good and the apartment is ok. But since there are multiple other choices in this same area for the same price range, I cannot recommend this one.