Everything as I expected. The room is exactly as pictured and kept in mint condition. Everything is so clean and organised in her place. The kitchen is full of amenities. As travellers for an overnight stay, everything was excellent. We lost a few minutes finding the place but no big deal. Also, from the Central Mestre station to her place is just a 12 min. walk if you're into walking. Google Maps will help you. It's pretty straightforward.
The surroundings are cool. We didn't get to explore much in Mestre because of time constraints, but there's a small shopping centre 2-3 mins walk away and a supermarket. So if you're craving specifics that are not in Katia's kitchen you're covered. It's pretty convenient.
You can buy bus tickets to go to Venice in the corner shop located less than 2 mins away (as you leave the building, go right and cross the street). Once you have the tickets assume you're back at Katia's place and instead of right, go left and walk straight. You'll see a church at the end (yes, it's a church, but with a tiny cross at the top). Go there and instead of following the same road, turn right and keep walking. The stop will be on your left-hand side (it's a bit tricky to spot it). Bus 7-E will take you to Venice in about 20 mins. Easy.
The area seemed safe to me so I recommend Katia's place.