Why only 4 out 5?! Well in the list of favourite hotels in Cuba on this site only one hotel beats it - Paradisus Rio de Oro in Guardalavaca which is where my wife and I stayed prior to coming to Havana. As a result any hotel would struggle to compare. Plus we were disappointed with the breakfast buffet again maybe because we had been spoiled at the resort. Other than this the Parque Central is an excellent hotel.
Beautifully furnished with excellent restaurants, an excellent lobby bar serving wonderful cocktails and the star attraction the rooftop pool. This feature in particular endeared us to the hotel as it enabled us to escape the hustle & bustle of the city and pretend we were back at our resort. There are incredible views from the roof also. We had considered getting a simpler, cheaper hotel whilst in Havana but are so glad we didn't. The city is fascinating but we were a bit surprised at how much you get hassled by people in the street (we'd previously been to Holguin in the east and not had the same problems). So if you want to enjoy the excellent city of Havana but also take time out to enjoy the fact you are in the caribbean and relax then you want to stay in this hotel.

The Parque Central is a very good hotel in central Havana. Though the surrounding streets are busy the rooms are double glazed and very quiet. Very good rooms, decent size well looked after and serviced. The food is good. A varied buffet breakfast, good bar snacks in the lobby and the Paseo Restaurant, which has an unfair reputation of being expensive is very good. Staff are efficient and helpful the only mild exception being the off-hand receptionist who checked me out. The tour office in the lobby has very good helpful staff. We didn't use it but it has a roof top pool which has good views over the city and would be a good place to relax in the afternoon after a morning's walk around the city.

The lobby of this hotel is really worth a visit, a stunning inner patio and colonial style interiors. Also the cocktails served in the lobby are perfect after a day of city tours. All the main attractions are nearby. The best feature of the hotel would be the roof top swimming pool. I had a wonderful time, with a cocktail in one hand and a Cuban cigar in my other hand, enjoying the sunset.

The Parque Central is one of the nicest hotels I have every stayed at.
The rooms were great. Had a stunning view of the Capitolio at sunset.
The location could not be better and the amenities equal to 5 star hotels in the states. Stay the the Parque Central and then have lunch on the terrace or go to a concert at the Nacional.

BTW, the food is pretty uniformly awful anywhere in Cuba other than places like La Guarida. However, the full buffet breakfasts (including wonderful made to order omlets) are fabulous at Parque Central as is the hamburgers in the lobby bar.