Timing
Timeline for renting: When you found your ideal apartment it may takes time to moving in. If the owners is individual, and the apartment is a cheaper one mostly you can sign a contract at the monent and reserve the apartment with a part of the deposit, or to pay the whole deposit and first month rental fee, and you can take the keys. In the case of more valueable apartments it takes more times to formulate the contract, sum all equipments in the inventory list. In the case of property management companies you have to go to the company office to sign the contract. They prefer to having a day for prepare the contract, arrange the contract details and the signatories datas properly.
Internet/cable tv subscription: You can subscribe the internet/tv by email in the supplier website, or personally in the office. When your demands is registrated by the supplier( if you personally it happens at the moment, in you send email it takes 2-3 woring days), they ask you for a date in 2-3 days to start the service in your apartment, that time you have to be at home to enter the serviceman. Now it is possibile to supscript for the service even 2 months short term as well, in the case of some company (for example UPC), if you stay hungary just for some months long term.
Mobile internet: Mobile internet is very popular in Hungary, you can use it anywhere in Budapest. In the case of 1 year long contract you will have a very fast mobile connection for the same price as cable internet. Disadvantage is the download/upload limit, it is about 5 Mb/month. There is the possibility to buy prepaid package as well.