Nirvana is not a place like heaven to experience. Its merely seeing the world as is without the wale of Moha blocking our view. When you attain Sopadisesa Nirvana you get to see the process that binds you to Sansara, and in that, you realize there is nothing worth clinging onto, thus removing the reasons to Bhawa (simply means rebirth). So, at Anupadisesa Nirvana, when your body dies, there there will be no rebirth for you, thus breaking the cycle of birth and death (sansara).
Due to Moha, we never get to experience the world as is. Everything we do, is targeted towards building the concept of 'myself'. In this conceptual world we build ourselves with 'myslef' at the center, we form attachments of Lobha (attraction), Dwesha (desisting) or neither Lobha nor Dwesha.
- If we take Lobha attachments, the 'self' is ascertained by thinking that something is good for 'me'.
- If we take Dwesha attachments, the 'self' is ascertained by thinking that something is bad for 'me'.
- If we take neither Lobha nor Dwesha attachments, the 'self' is ascertained by thinking that something is neither good nor bad for 'me'.
This is a very tiresome thing for all of us, but we do not know any better. We simply do this over and over when interacting or identifying anything in the world, and build up the conceptual world within our mind accordingly. This is why we never see the reality. We always see a reflection of our own mind.
If you take your own body, how many aches and pains are there? How many diseases are there? Don't you fear of getting diseases in the future? You may not be happy of your weight, height, muscle structure, metabolic rate, body odor, hair, etc. Even to maintain your body you have to feed it, bathe it, dress it, tend to its needs. Even if you do them all today, your tasks are not done. You need to repeat them tomorrow, the day after, and until you die. Lord Budhdha shows us that it will not be over even after death. Because we are bound to Sansara, we will receive another body to maintain, fear, care, hate, or like. As long as there is someone (sakkhaya dhitti) they will face suffering (dukhkha).
According to Lord Budhdha, there are 31 plains of existence, 31 plains where we can be reborn. And we have no control over that. These plains have different kind of bodies and minds. In some plains there are lifespans of eons. Whatever the plain you are born, as long as there is someone they will face suffering (dukhkha).
Nirvana is the end of this endless cycle. There is no one to suffer at Nirvana. That's why its a bliss.
Note: When Nirvana is realized in this life with the body remaining, it is called Sopadisesa nibbana-dhatu. When an Arahat attains Parinibbana, after the dissolution of his body, without any remainder of physical existence it is called Anupadisesa nibbana-dhatu.