A bit far from the centre (look at the map).
Very clean b&b with modern fresh interiors (IKEA furniture). Good bed, safe, large wardrobe with a lot of racks, air-cond in the room.
There is a living room and a small balcony for all guests. A bathroom is shared. There is hairdrier, showergel, shampoo in the bathroom.
Supermarket is across the street (1 minute) - you can find cheese, fresh bread, meat and everything there.
The beach is in 5 minutes walking - but the sea is very shallow. 10 minutes walking to private beaches, shops and restaurants in touristic port, about 20 minutes walking to the centre of Ostia. You can reach the centre by bus #62, train station "Stazione di Lido di Ostia Centrale" - by bus #01.
The mark of this B&B in GoogleMaps is not exactly correct!
The landlady Ilaria is very, very friendly. It is obligatory to say her when you are going to arrive (by email or sms)! You will get the keys from b&b and your room and complimentary refreshments) Ilaria prepares the breakfast every day, but doesn't spend a whole day there.