So here it is (as I read other people's reviews to help me decide on accomodation, it is fair that I help someone too):
1. Cleanliness is perfect; there are also spounge, detergent, extra garbage bags etc.)
2. Size of the apartment - very spacious with anteroom, large rooms, large kichen, balcony in full lenght of the apartment with the view towards Etna (one can see lava during the night - literally); there are 2 bathrooms (one with shower, one with bath tub) which I find important if there is higher number of people in the apartment; comfortable mattresses; large table with enough chairs; It is aloso good fro toddlers as it is very spacious and they will have space to wlak around and play;
3. Equipment in the apartment - I has everything one needs - wife is great; hairdryer, microwave, quilts, extra towels in addition to 3 towels each guest gets; large refrigerator; small freezer, etc.), it even has scale (takes a minute to figure out how it works; inner circle shows kg); Air conditioning is also there. We did not cook (we came to enjoy in Italian food too:) but I believe there is everything needed in case someone wants to do that. There is also large TV there which was very important given we were there in the time on fthe finals of Champion league:); lamps next to the bad, a lot of box shelfs in the living room which is very helpful to leave the staff); there is also chair for the kid ;
4. Location - 7-8min walk to Central train and bus station and 5min to city center; if you did not rent a car this is even more important - we used trains to go to Syracusa, Taormina and Noto; bus to Etna and legs:) to go to city center - super easy and we did not miss a car at all (we had 4 full days in Sicily, 5 nights); airport is 15min ride from the central train station/apartmant so that's also convinient (we paid 30€ for a taxi ride with a car with 5 seats when we came and 35€ for a large van when we were going back; bus ticket is 3€in one direction and the bus departs every 25min)
5. Surrounding - Lidl is in front of the building (opened until 10pm I believe), Penny next to it and nice Italian shop Duce (or something like that) between them; it not a touristy area so do not expect small bars, bakaries next to the building but you won't miss them as city is close and for the remainder there is Lidl;
6. Welcome - beyond expected - bottles of water in the freezer, juice, coke, bowl full of fresh fruits, fruit yogurths, cofee and milk in the fridge, cookies and ...I am sure there were also other things which I cannot remeber now; in the bathroom one could find tooth paste, deodorant and similar things (bring your own:), I would see these as emergency kit)
7. Hosts - so nice; our plane was 2h late which was even worse since we arrived at 11pm; Nicolo and his wife did not make a fuss about it at all; Nicolo called the afternoon before we departed and we agreed that I will call him after we land; him and his wife waited for us in the apartment and gave us key information. Nicolo called the day before we departed to ask when can he come to say bye and was very kind.
If I have to mention the minuses, there are 3 minor ones:
1. There is few homless people that sleep close to the building (but the neighbourhoud does not seem dangerous at all, as Italians walked around relaxed and pay no attention to that); All in all, saidly to say, there is a lot of garbage on all non-main strees in every city in Italy, but I suppose they are use to that)
2. Nicolo does not speak Italian, BUT with google translate, arms and legs you are completely fine and will manage it without a problem;
3. Noise in the morning - parking lot behind the building becomes organized open market in the morning so if you are of very light sleep and want to sleep until late in the morning...We did not see it as a problem as we came to enjoy the places and walk around and not to sleep until noon.
All in all, we would rate the place 10/10 and would recommend anyone to stay here while visiting east side of the island.