I stayed here because Majestic Suites was full but the Top Inn is not recommended and if you want a budget hotel near to Nana BTS then Majestic or the next door Parkway Inn are much better choices.
I found the Reception Staff uninterested, the room okay but it lacked basics such as soap, had no safe, and there was no plug for the basin. The worst aspect is that the hotel has little sound proofing and certainly is not double glazed so every passing Skytrain is very noticeable. I will not make the mistake of staying again; I suggest you do not either unless you want an uncomfortable and noisy night served by an uncaring staff.