I have a separate guest toilet without windows using a ceiling extractor fan - not a problem. I also have internal cavity sliding doors to bathrooms and toilets and love how they give extra space and options regarding placement of items. Another location alternative for you may be between the cinema room and the kitchen, depending on what you had planned for that extra space in the kitchen. Two metres is a wide hallway, if that is what it is? Ours is 1.3 which is considered wide (as we need to accommodate a wheelchair which has to turn into doorways). An advantage of a very wide hallway is it gives room for extra furniture placement such as bookshelves, linen or other cupboards if needed. I don't see a linen cupboard or pantry cupboard in your plans. Something else to think about is future proofing - try to cover future possibilities with regard to function, as making structural or fittings changes later can be more expensive, and may come at a time when you can least afford it (e.g. injured, disabled, children, aging or other such people visiting your home). Lives change, sometimes over time, sometimes in an instant, and suddenly the doors are not wide enough (especially the toilet door!), or the walls are not strong enough for a weight-bearing rail, and a host of other things. We put 900cm doors as a minimum and it makes life a lot easier, including moving furniture in and out. Universal Design principles are worth a look. Sadly these considerations are currently considered special or optional, although there are moves to change that, so that builders and architects will consider these things as standard.

If you are going for a concealed cistern don't go cheap. This is true of any plumbing - buy quality everytime as the labour and hassle of removing and replacing is often worth more than the fitting. If you ever need to replace it then you will be removing tiling and plasterboard to do it. There are lots of compact toilet suites that have traditional placed compact cisterns that don't take up a lot more length that a pan with a concealed cistern. If you are on a tight budget I would carefully research these options before commiting to a concealed cistern. For instance Caroma has a model range called Luna and there is only 60mm difference between the pans with the concealed wall cistern and the traditional suite (which is a lot cheaper and easier to service). As with any tight space you must measure up very carefully, and small bathrooms can be problemmatic. https://www.caroma.com.au/category-product/toilet-suites Australian brands are usually better supported than imported. Best of luck, Dr Retro of Dr Retro House Calls

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Plumbing problems can be complicated, and trying to fix the problem yourself can lead to temporary solutions and even more damage in the long run. That's why calling a professional plumber is definitely a wise decision. After all, they are experienced in diagnosing and fixing various problems with the toilet bowl. Ideally, your company specializes in such repairs because it is tough to find a quality company nowadays. I am sure that professionals like you have a document to pass the journeyman exam because the journeyman exam is provided to show the competence of Plumbers. In any case, best of luck and prosperity to your company.