Small rooms, cleanliness to be improved, parking far away from the hotel (300-400 meters), private beach crowdy and whose cleanliness to be improved (rude service at the private beach).
Noise of the street until 2:00 am.
Poor breakfast (not really what could be called a buffet)
So it is a bad value for the price (256 euros)

We have spent a week with our 3yr old daugther this summer in this wonderful hotel.

It is a rare find because it is both stylish and is well located on the Italian seaside. We all know what a rare combination this is.

Our room overlooked a sea, and the little terrace overlooking the Rotunda Pier for which Senigallia is famous for. The beach is 20 meters away.

Staff are extremely polite and helpful in every way, and the bicycles you can use anytime are a nice touch.

The only small issue is that we have found that the choice of the breakfast did not match the otherwise very high standards set out by the hotel in all other areas- but since you have so mch to eat for lunch and dinner this is barely a problem. The hotel has its own restaurant which is pretty good too.

In a nutshell- we will return next year.

We loved this hotel. In a perfect position facing the beach. The hotel has its own private beach. We had a room with a balcony facing the sea which I would recommend. The breakfast was served on the roof garden and one could sit outside if the weather permitted. The breakfast was very good, lots of fruit, lovely selection of rolls and bread and cheeses etc. The staff were very friendly and could not do enough to help you. In fact the rooms were too clean ... the cleaners changed the toilet roll and soap every day and washed out beach towels even though they did not need it. I would definitely stay here again if in the area.

My wife and one year old spent a wonderful one day mini-vacation at Terrazza Marconi in late September. TM might very well be the best hotel in Senigallia. Great location, about 70 feet (yes, as in 20 meters!) from their own private beach, very clean, modern, classy rooms with lots of personality, breathtaking view breakfast terrace (hence the name) and great service, quite rare in an 4-star hotel in Italy. They have approx 30 rooms and the hotels feels like a boutique hotel, but without the idiosyncrasies of a boutique hotel. They have bikes you can borrow, beach towels, free ombrelloni & lettini (the Italian way to enjoy the beach), and the staff will go above and beyond to make your stay truly enjoyable.
I honestly can not think of a single negative. The rates aren't cheap, but well worth the unique experience.
This property is a true gem and we will definitely stay there for our next trip to Senigallia.